0
+ − 1 // **************************************************************
+ − 2 // p2_deco.c
+ − 3 //
+ − 4 // Created on: 12.05.2009
+ − 5 // Author: chsw
+ − 6 //
+ − 7 // **************************************************************
+ − 8
+ − 9 //////////////////////////////////////////////////////////////////////////////
+ − 10 // OSTC - diving computer code
+ − 11 // Copyright (C) 2011 HeinrichsWeikamp GbR
+ − 12 //
+ − 13 // This program is free software: you can redistribute it and/or modify
+ − 14 // it under the terms of the GNU General Public License as published by
+ − 15 // the Free Software Foundation, either version 3 of the License, or
+ − 16 // (at your option) any later version.
+ − 17 //
+ − 18 // This program is distributed in the hope that it will be useful,
+ − 19 // but WITHOUT ANY WARRANTY; without even the implied warranty of
+ − 20 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ − 21 // GNU General Public License for more details.
+ − 22 //
+ − 23 // You should have received a copy of the GNU General Public License
+ − 24 // along with this program. If not, see <http://www.gnu.org/licenses/>.
+ − 25 //
+ − 26 //////////////////////////////////////////////////////////////////////////////
+ − 27
+ − 28 // *****************************
+ − 29 // ** I N T R O D U C T I O N **
+ − 30 // *****************************
+ − 31 //
+ − 32 // OSTC
+ − 33 //
+ − 34 // code:
+ − 35 // p2_deco_main_c_v101.c
+ − 36 // part2 of the OSTC code
+ − 37 // code with constant O2 partial pressure routines
+ − 38 // under construction !!
+ − 39 //
+ − 40 // summary:
+ − 41 // decompression routines
+ − 42 // for the OSTC experimental project
+ − 43 // written by Christian Weikamp
+ − 44 // last revision __________
+ − 45 // comments added _________
+ − 46 //
+ − 47 // additional files:
+ − 48 // p2_tables_v100.romdata (other files)
+ − 49 // 18f4685_ostc_v100.lkr (linker script)
+ − 50 //
+ − 51 // history:
+ − 52 // 01/03/08 v100: first release candidate
+ − 53 // 03/13/08 v101: start of programming ppO2 code
+ − 54 // 03/13/25 v101a: backup of interrim version with ppO2 calculation
+ − 55 // 03/13/25 v101: open circuit gas change during deco
+ − 56 // 03/13/25 v101: CNS_fraction calculation
+ − 57 // 03/13/26 v101: optimization of tissue calc routines
+ − 58 // 07/xx/08 v102a: debug of bottom time routine
+ − 59 // 09/xx/08 v102d: Gradient Factor Model implemenation
+ − 60 // 10/10/08 v104: renamed to build v103 for v118 stable
+ − 61 // 10/14/08 v104: integration of char_I_depth_last_deco for Gradient Model
+ − 62 // 03/31/09 v107: integration of FONT Incon24
+ − 63 // 05/23/10 v109: 5 gas changes & 1 min timer
+ − 64 // 07/13/10 v110: cns vault added
+ − 65 // 12/25/10 v110: split in three files (deco.c, main.c, definitions.h)
+ − 66 // 2011/01/20: [jDG] Create a common file included in ASM and C code.
+ − 67 // 2011/01/24: [jDG] Make ascenttime an short. No more overflow!
+ − 68 // 2011/01/25: [jDG] Fusion deco array for both models.
+ − 69 // 2011/01/25: [jDG] Use CF(54) to reverse deco order.
+ − 70 // 2011/02/11: [jDG] Reworked gradient-factor implementation.
+ − 71 // 2011/02/15: [jDG] Fixed inconsistencies introduced by gas switch delays.
+ − 72 // 2011/03/21: [jDG] Added gas consumption (CF56 & CF57) evaluation for OCR mode.
+ − 73 // 2011/04/15: [jDG] Store low_depth in 32bits (w/o rounding), for a better stability.
+ − 74 // 2011/04/25: [jDG] Added 1mn mode for CNS calculation, to allow it for decoplanning.
+ − 75 // 2011/04/27: [jDG] Fixed char_O_gradient_factor calculation when model uses gradient-factor.
+ − 76 // 2011/05/02: [jDG] Added "Future TTS" function (CF58).
+ − 77 // 2011/05/17: [jDG] Various cleanups.
+ − 78 // 2011/08/08: [jDG] Computes CNS during deco planning ascent.
+ − 79 // 2011/11/24: [jDG] Slightly faster and better NDL computation.
+ − 80 // 2011/12/17: [mH] Remove of the useless debug stuff
+ − 81 // 2012/02/24: [jDG] Remove missed stop bug.
+ − 82 // 2012/02/25: [jDG] Looking for a more stable LOW grad factor reference.
+ − 83 // 2012/09/10: [mH] Fill char_O_deco_time_for_log for logbook write
+ − 84 // 2012/10/05: [jDG] Better deco_gas_volumes accuracy (average depth, switch between stop).
+ − 85 // 2013/03/05: [jDG] Should vault low_depth too.
+ − 86 // 2013/03/05: [jDG] Wrobell remark: ascent_to_first_stop works better with finer steps (2sec).
33
+ − 87 // 2013/05/08: [jDG] A. Salm remark: NOAA tables for CNS are in ATA, not bar.
115
+ − 88 // 2013/12/21: [jDG] Fix CNS calculation in decoplan w/o marked gas switch
+ − 89 // 2014/06/16: [jDG] Fix Helium diluant. Fix volumes with many travel mix.
123
+ − 90 // 2014/06/29: [mH] Compute int_O_ceiling
0
+ − 91 //
+ − 92 // TODO:
+ − 93 //
+ − 94 // Literature:
+ − 95 // Bühlmann, Albert: Tauchmedizin; 4. Auflage [2002];
+ − 96 // Schr"oder, Kai & Reith, Steffen; 2000; S"attigungsvorg"ange beim Tauchen, das Modell ZH-L16, Funktionsweise von Tauchcomputern; http://www.achim-und-kai.de/kai/tausim/saett_faq
+ − 97 // Morrison, Stuart; 2000; DIY DECOMPRESSION; http://www.lizardland.co.uk/DIYDeco.html
+ − 98 // Balthasar, Steffen; Dekompressionstheorie I: Neo Haldane Modelle; http://www.txfreak.de/dekompressionstheorie_1.pdf
+ − 99 // Baker, Erik C.; Clearing Up The Confusion About "Deep Stops"
+ − 100 // Baker, Erik C.; Understanding M-values; http://www.txfreak.de/understanding_m-values.pdf
+ − 101 //
+ − 102 //
+ − 103
+ − 104 // *********************
+ − 105 // ** I N C L U D E S **
+ − 106 // *********************
+ − 107 #include <math.h>
+ − 108
+ − 109 // ***********************************************
+ − 110 // ** V A R I A B L E S D E F I N I T I O N S **
+ − 111 // ***********************************************
+ − 112
+ − 113 #include "p2_definitions.h"
+ − 114 #define TEST_MAIN
+ − 115 #include "shared_definitions.h"
+ − 116
+ − 117 // Water vapour partial pressure in the lumb.
+ − 118 #define ppWater 0.0627
+ − 119 #define METER_TO_BAR 0.09985
+ − 120 #define BAR_TO_METER 10.0150 // (1.0/METER_TO_BAR)
+ − 121
+ − 122 // Surface security factor
+ − 123 #define SURFACE_DESAT_FACTOR 0.7042
+ − 124
+ − 125 // *************************
+ − 126 // ** P R O T O T Y P E S **
+ − 127 // *************************
+ − 128
+ − 129 static void calc_hauptroutine(void);
+ − 130 static void calc_nullzeit(void);
+ − 131
+ − 132 static void calc_tissue(PARAMETER unsigned char period);
+ − 133 static void calc_limit(void);
+ − 134
+ − 135 static void clear_tissue(void);
+ − 136 static void calc_ascenttime(void);
+ − 137 static void update_startvalues(void);
+ − 138 static void clear_deco_table(void);
+ − 139 static unsigned char update_deco_table(void);
+ − 140
+ − 141 static void sim_tissue(PARAMETER unsigned char period);
+ − 142 static void sim_limit(PARAMETER float GF_current);
+ − 143 static void sim_extra_time(void);
+ − 144 static void calc_dive_interval(void);
+ − 145
+ − 146 static void calc_gradient_factor(void);
+ − 147 static void calc_wo_deco_step_1_min(void);
+ − 148
+ − 149 static void calc_hauptroutine_data_input(void);
+ − 150 static void calc_hauptroutine_update_tissues(void);
+ − 151 static void calc_hauptroutine_calc_deco(void);
+ − 152 static void sim_ascent_to_first_stop(void);
+ − 153
+ − 154 static unsigned char gas_switch_deepest(void);
+ − 155 static void gas_switch_set(void);
+ − 156
+ − 157 static unsigned char calc_nextdecodepth(void);
+ − 158
+ − 159 //---- Bank 5 parameters -----------------------------------------------------
+ − 160 #ifndef UNIX
+ − 161 # pragma udata bank5=0x500
+ − 162 #endif
+ − 163
+ − 164 static float GF_low;
+ − 165 static float GF_high;
+ − 166 static float GF_delta;
+ − 167 static float locked_GF_step; // GF_delta / low_depth
+ − 168
+ − 169 static unsigned char temp_depth_limit;
+ − 170 static unsigned char low_depth; // Depth of deepest stop
+ − 171
+ − 172 // Simulation context: used to predict ascent.
+ − 173 static unsigned char sim_lead_tissue_no; // Leading compatiment number.
+ − 174 static float sim_lead_tissue_limit; // Buhlmann tolerated pressure.
+ − 175
+ − 176 // Real context: what we are doing now.
+ − 177 static float calc_lead_tissue_limit; //
+ − 178
+ − 179 static unsigned char internal_deco_time[NUM_STOPS];
+ − 180 static unsigned char internal_deco_depth[NUM_STOPS];
+ − 181
+ − 182 static float cns_vault;
+ − 183 static float low_depth_vault;
+ − 184 static float pres_tissue_N2_vault[NUM_COMP];
+ − 185 static float pres_tissue_He_vault[NUM_COMP];
+ − 186
+ − 187 //---- Bank 6 parameters -----------------------------------------------------
+ − 188 #ifndef UNIX
+ − 189 # pragma udata bank6=0x600
+ − 190 #endif
+ − 191
+ − 192 static unsigned char ci;
+ − 193 static float pres_respiration;
+ − 194 static float pres_surface;
+ − 195 static float temp_deco;
+ − 196 static float ppN2;
+ − 197 static float ppHe;
+ − 198 static float temp_tissue;
+ − 199 static float N2_ratio; // Breathed gas nitrogen ratio.
+ − 200 static float He_ratio; // Breathed gas helium ratio.
+ − 201 static float var_N2_a; // Bühlmann a, for current N2 tissue.
+ − 202 static float var_N2_b; // Bühlmann b, for current N2 tissue.
+ − 203 static float var_He_a; // Bühlmann a, for current He tissue.
+ − 204 static float var_He_b; // Bühlmann b, for current He tissue.
+ − 205 static float var_N2_e; // Exposition, for current N2 tissue.
+ − 206 static float var_He_e; // Exposition, for current He tissue.
+ − 207 static float var_N2_ht; // Half-time for current N2 tissue.
+ − 208 static float var_He_ht; // Half-time for current N2 tissue.
+ − 209
+ − 210 static float pres_diluent; // new in v.101
+ − 211 static float const_ppO2; // new in v.101
+ − 212
+ − 213 static unsigned char sim_gas_last_depth; // Depth of last used gas, to detected a gas switch.
+ − 214 static unsigned char sim_gas_last_used; // Number of last used gas, to detected a gas switch.
+ − 215 static unsigned short sim_dive_mins; // Simulated dive time.
+ − 216 static float calc_N2_ratio; // Simulated (switched) nitrogen ratio.
+ − 217 static float calc_He_ratio; // Simulated (switched) helium ratio.
+ − 218 static float CNS_fraction; // new in v.101
+ − 219 static float float_saturation_multiplier; // new in v.101
+ − 220 static float float_desaturation_multiplier; // new in v.101
+ − 221 static float float_deco_distance; // new in v.101
+ − 222
+ − 223 static unsigned char deco_gas_change[NUM_GAS]; // new in v.109
111
+ − 224 static unsigned char internal_deco_gas [NUM_STOPS];
0
+ − 225
+ − 226 //---- Bank 7 parameters -----------------------------------------------------
+ − 227 #ifndef UNIX
+ − 228 # pragma udata bank7=0x700
+ − 229 #endif
133
+ − 230 // Keep order of 0x700 variables
0
+ − 231 float pres_tissue_N2[NUM_COMP];
+ − 232 float pres_tissue_He[NUM_COMP];
+ − 233 float sim_pres_tissue_N2[NUM_COMP]; // 16 floats = 64 bytes.
+ − 234 float sim_pres_tissue_He[NUM_COMP]; // 16 floats = 64 bytes.
+ − 235
+ − 236 //---- Bank 8 parameters -----------------------------------------------------
+ − 237 #ifndef UNIX
+ − 238 # pragma udata overlay bank8=0x800
+ − 239 static char md_pi_subst[256];
+ − 240 # define C_STACK md_pi_subst // Overlay C-code data stack here, too.
+ − 241 #endif
+ − 242
+ − 243 // Back to bank6 for further tmp data
+ − 244 #ifndef UNIX
+ − 245 # pragma udata bank6
+ − 246 #endif
+ − 247
+ − 248 //////////////////////////////////////////////////////////////////////////////
+ − 249 //////////////////////////////////////////////////////////////////////////////
+ − 250 ///////////////////////////// THE LOOKUP TABLES //////////////////////////////
+ − 251 //////////////////////////////////////////////////////////////////////////////
+ − 252 //////////////////////////////////////////////////////////////////////////////
+ − 253 //
+ − 254 // End of PROM code is 17F00, So push tables on PROM top...
+ − 255 //
+ − 256 #ifndef UNIX
+ − 257 # pragma romdata buhlmann_tables = 0x1DD00 // Needs to be in UPPER bank.
+ − 258 #endif
+ − 259
+ − 260 #include "p2_tables.romdata" // new table for deco_main_v.101 (var_N2_a modified)
+ − 261
+ − 262 //////////////////////////////////////////////////////////////////////////////
+ − 263 //////////////////////////////////////////////////////////////////////////////
+ − 264 ////////////////////////////// THE SUBROUTINES ///////////////////////////////
+ − 265 //////////////////////////////////////////////////////////////////////////////
+ − 266 //////////////////////////////////////////////////////////////////////////////
+ − 267 //
+ − 268 // all new in v.102
+ − 269 // moved from 0x0D000 to 0x0C000 in v.108
+ − 270 #ifndef UNIX
+ − 271 # pragma code p2_deco = 0x0C000
+ − 272 #endif
+ − 273
+ − 274 //////////////////////////////////////////////////////////////////////////////
+ − 275 //////////////////////////////////////////////////////////////////////////////
+ − 276 /////////////////////// U T I L I T I E S /////////////////////////////////
+ − 277 //////////////////////////////////////////////////////////////////////////////
+ − 278 //////////////////////////////////////////////////////////////////////////////
+ − 279
+ − 280 //////////////////////////////////////////////////////////////////////////////
+ − 281 // Bump to blue-screen when an assert is wrong
+ − 282 #ifdef __DEBUG
+ − 283 void assert_failed(PARAMETER short int line)
+ − 284 {
+ − 285 }
+ − 286 #endif
+ − 287
+ − 288 //////////////////////////////////////////////////////////////////////////////
+ − 289 // When calling C code from ASM context, the data stack pointer and
+ − 290 // frames should be reset. Bank8 is used by stack
+ − 291
+ − 292 #ifdef CROSS_COMPILE
+ − 293 # define RESET_C_STACK
+ − 294 #else
+ − 295 # ifdef __DEBUG
+ − 296 # define RESET_C_STACK fillDataStack();
+ − 297 void fillDataStack(void)
+ − 298 {
+ − 299 _asm
+ − 300 LFSR 1,C_STACK
+ − 301 MOVLW 0xCC
+ − 302 loop: MOVWF POSTINC1,0
+ − 303 TSTFSZ FSR1L,0
+ − 304 BRA loop
+ − 305
+ − 306 LFSR 1,C_STACK
+ − 307 LFSR 2,C_STACK
+ − 308 _endasm
+ − 309 }
+ − 310 # else
+ − 311 # define RESET_C_STACK \
+ − 312 _asm \
+ − 313 LFSR 1, C_STACK \
+ − 314 LFSR 2, C_STACK \
+ − 315 _endasm
+ − 316 # endif
+ − 317 #endif
+ − 318
+ − 319 //////////////////////////////////////////////////////////////////////////////
+ − 320 // Fast subroutine to read timer 5.
+ − 321 // Note: result is in 1/32 of msecs (30,51757813µs/bit to be precise)
+ − 322 static unsigned short tmr5(void)
+ − 323 {
+ − 324 #ifndef CROSS_COMPILE
+ − 325 _asm
+ − 326 movff 0xf7c,PRODL // TMR5L
+ − 327 movff 0xf7d,PRODH // TMR5H
+ − 328 _endasm // result in PRODH:PRODL.
+ − 329 #else
+ − 330 return 0;
+ − 331 #endif
+ − 332 }
+ − 333
+ − 334
+ − 335 //////////////////////////////////////////////////////////////////////////////
+ − 336 // read buhlmann tables A and B for compatriment ci
+ − 337 //
+ − 338 static void read_buhlmann_coefficients(void)
+ − 339 {
+ − 340 #ifndef CROSS_COMPILE
+ − 341 // Note: we don't use far rom pointer, because the
+ − 342 // 24 bits is too complex, hence we have to set
+ − 343 // the UPPER page ourself...
+ − 344 // --> Set zero if tables are moved to lower pages !
+ − 345 _asm
+ − 346 movlw 1
+ − 347 movwf TBLPTRU,0
+ − 348 _endasm
+ − 349 #endif
+ − 350
+ − 351 assert( ci < NUM_COMP );
+ − 352
+ − 353 // Use an interleaved array (AoS) to access coefficients with a
+ − 354 // single addressing.
+ − 355 {
+ − 356 overlay rom const float* ptr = &buhlmann_ab[4*ci];
+ − 357 var_N2_a = *ptr++;
+ − 358 var_N2_b = *ptr++;
+ − 359 var_He_a = *ptr++;
+ − 360 var_He_b = *ptr++;
+ − 361 }
+ − 362 }
+ − 363
+ − 364 //////////////////////////////////////////////////////////////////////////////
+ − 365 // read buhlmann tables for compatriment ci
+ − 366 // If period == 0 : 2sec interval
+ − 367 // 1 : 1 min interval
+ − 368 // 2 : 10 min interval.
+ − 369 static void read_buhlmann_times(PARAMETER char period)
+ − 370 {
+ − 371 #ifndef CROSS_COMPILE
+ − 372 // Note: we don't use far rom pointer, because the
+ − 373 // 24 bits is to complex, hence we have to set
+ − 374 // the UPPER page ourself...
+ − 375 // --> Set zero if tables are moved to lower pages !
+ − 376 _asm
+ − 377 movlw 1
+ − 378 movwf TBLPTRU,0
+ − 379 _endasm
+ − 380 #endif
+ − 381
+ − 382 assert( ci < NUM_COMP );
+ − 383
+ − 384 // Integration intervals.
+ − 385 switch(period)
+ − 386 {
+ − 387 case 0: //---- 2 sec -----------------------------------------------------
+ − 388 {
+ − 389 overlay rom const float* ptr = &e2secs[2*ci];
+ − 390 var_N2_e = *ptr++;
+ − 391 var_He_e = *ptr++;
+ − 392 }
+ − 393 break;
+ − 394
+ − 395 case 1: //---- 1 min -----------------------------------------------------
+ − 396 {
+ − 397 overlay rom const float* ptr = &e1min[2*ci];
+ − 398 var_N2_e = *ptr++;
+ − 399 var_He_e = *ptr++;
+ − 400 }
+ − 401 break;
+ − 402
+ − 403 case 2: //---- 10 min ----------------------------------------------------
+ − 404 {
+ − 405 overlay rom const float* ptr = &e10min[2*ci];
+ − 406 var_N2_e = *ptr++;
+ − 407 var_He_e = *ptr++;
+ − 408 }
+ − 409 break;
+ − 410
+ − 411 default:
+ − 412 assert(0); // Never go there...
+ − 413 }
+ − 414 }
+ − 415
+ − 416 //////////////////////////////////////////////////////////////////////////////
+ − 417 // read buhlmann tables for compatriment ci
+ − 418 //
+ − 419 static void read_buhlmann_ht(void)
+ − 420 {
+ − 421
+ − 422 #ifndef CROSS_COMPILE
+ − 423 // Note: we don't use far rom pointer, because the
+ − 424 // 24 bits is to complex, hence we have to set
+ − 425 // the UPPER page ourself...
+ − 426 // --> Set zero if tables are moved to lower pages !
+ − 427 _asm
+ − 428 movlw 1
+ − 429 movwf TBLPTRU,0
+ − 430 _endasm
+ − 431 #endif
+ − 432
+ − 433 assert( ci < NUM_COMP );
+ − 434 {
+ − 435 overlay rom const float* ptr = &buhlmann_ht[2*ci];
+ − 436 var_N2_ht = *ptr++;
+ − 437 var_He_ht = *ptr++;
+ − 438 }
+ − 439
+ − 440 assert( 4.0 <= var_N2_ht && var_N2_ht <= 635.0 );
+ − 441 assert( 1.5099 <= var_He_ht && var_He_ht <= 240.03 );
+ − 442 }
+ − 443
+ − 444 //////////////////////////////////////////////////////////////////////////////
+ − 445 // calc_nextdecodepth
+ − 446 //
+ − 447 // new in v.102
+ − 448 //
+ − 449 // INPUT, changing during dive:
+ − 450 // temp_deco
+ − 451 // low_depth
+ − 452 //
+ − 453 // INPUT, fixed during dive:
+ − 454 // pres_surface
+ − 455 // GF_delta
+ − 456 // GF_high
+ − 457 // GF_low
+ − 458 // char_I_depth_last_deco
+ − 459 // float_deco_distance
+ − 460 //
+ − 461 // RETURN TRUE iff a stop is needed.
+ − 462 //
+ − 463 // OUTPUT
+ − 464 // locked_GF_step
+ − 465 // temp_depth_limt
+ − 466 // low_depth
+ − 467 //
+ − 468 static unsigned char calc_nextdecodepth(void)
+ − 469 {
+ − 470 //--- Max ascent speed ---------------------------------------------------
+ − 471 // Recompute leading gas limit, at current depth:
+ − 472 overlay float depth = (temp_deco - pres_surface) * BAR_TO_METER;
+ − 473
+ − 474 // At most, ascent 1 minute, at 10m/min == 10.0 m.
+ − 475 overlay float min_depth = (depth > 10.0) ? (depth - 10.0) : 0.0;
+ − 476
+ − 477 // Do we need to stop at current depth ?
+ − 478 overlay unsigned char need_stop = 0;
+ − 479
+ − 480 assert( depth >= -0.2 ); // Allow for 200mbar of weather change.
+ − 481
+ − 482 //---- ZH-L16 + GRADIENT FACTOR model ------------------------------------
+ − 483 if( char_I_deco_model != 0 )
+ − 484 {
+ − 485 overlay unsigned char first_stop = 0;
+ − 486 overlay float p;
+ − 487
+ − 488 sim_limit( GF_low );
+ − 489 p = sim_lead_tissue_limit - pres_surface;
+ − 490 if( p <= 0.0f )
+ − 491 goto no_deco_stop; // We can surface directly...
+ − 492
+ − 493 p *= BAR_TO_METER;
+ − 494 if( p < min_depth )
+ − 495 goto no_deco_stop; // First stop is higher than 1' ascent.
+ − 496
+ − 497 first_stop = 3 * (short)(0.99999 + p*0.333333);
+ − 498 assert( first_stop < 128 );
+ − 499
+ − 500 // Apply correction for the shallowest stop.
+ − 501 if( first_stop == 3 ) // new in v104
+ − 502 first_stop = char_I_depth_last_deco; // Use last 3m..6m instead.
+ − 503
+ − 504 // Store the deepest point needing a deco stop as the LOW reference for GF.
+ − 505 // NOTE: following stops will be validated using this LOW-HIGH gf scale,
+ − 506 // so if we want to keep coherency, we should not validate this stop
+ − 507 // yet, but apply the search to it, as for all the following stops afterward.
+ − 508 if( first_stop > low_depth )
+ − 509 {
+ − 510 low_depth = first_stop;
+ − 511 locked_GF_step = GF_delta / first_stop;
+ − 512 }
+ − 513
+ − 514 // We have a stop candidate.
+ − 515 // But maybe ascending to the next stop will diminish the constraint,
+ − 516 // because the GF might decrease more than the preassure gradient...
+ − 517 while(first_stop > 0)
+ − 518 {
+ − 519 overlay unsigned char next_stop; // Next depth (0..90m)
+ − 520 overlay float pres_stop; // Next pressure (bar)
+ − 521
+ − 522 // Check max speed, or reaching surface.
+ − 523 if( first_stop <= min_depth )
+ − 524 goto no_deco_stop;
+ − 525
+ − 526 if( first_stop <= char_I_depth_last_deco ) // new in v104
+ − 527 next_stop = 0;
+ − 528 else if( first_stop == 6 )
+ − 529 next_stop = char_I_depth_last_deco;
+ − 530 else
+ − 531 next_stop = first_stop - 3; // Index of next (upper) stop.
+ − 532
+ − 533 // Just a check we are indeed above LOW ref.
+ − 534 assert( next_stop < low_depth );
+ − 535
+ − 536 // Total preassure at the new stop candidate:
+ − 537 pres_stop = next_stop * METER_TO_BAR
+ − 538 + pres_surface;
+ − 539
+ − 540 // Keep GF_low until a first stop depth is found:
+ − 541 sim_limit( GF_high - next_stop * locked_GF_step );
+ − 542
+ − 543 // Check upper limit (lowest pressure tolerated):
+ − 544 if( sim_lead_tissue_limit >= pres_stop ) // check if ascent to next deco stop is ok
+ − 545 goto deco_stop_found;
+ − 546
+ − 547 // Else, validate that stop and loop...
+ − 548 first_stop = next_stop;
+ − 549 }
+ − 550 assert( first_stop == 0 );
+ − 551
+ − 552 no_deco_stop:
+ − 553 temp_depth_limit = min_depth;
+ − 554 goto done;
+ − 555
+ − 556 // next stop is the last validated depth found, aka first_stop
+ − 557 deco_stop_found:
+ − 558 need_stop = 1; // Hit.
+ − 559 temp_depth_limit = first_stop; // Stop depth, in meter.
+ − 560
+ − 561 done:
+ − 562 ;
+ − 563 }
+ − 564 else //---- ZH-L16 model -------------------------------------------------
+ − 565 {
+ − 566 overlay float pres_gradient;
+ − 567
+ − 568 // Original model
+ − 569 // optimized in v.101
+ − 570 // char_I_depth_last_deco included in v.101
+ − 571
+ − 572 // Compute sim_lead_tissue_limit too, but just once.
+ − 573 sim_limit(1.0);
+ − 574
+ − 575 pres_gradient = sim_lead_tissue_limit - pres_surface;
+ − 576 if (pres_gradient >= 0)
+ − 577 {
+ − 578 pres_gradient *= BAR_TO_METER/3; // Bar --> stop number;
+ − 579 temp_depth_limit = 3 * (short) (pres_gradient + 0.99); // --> metre : depth for deco
+ − 580 need_stop = 1; // Hit.
+ − 581
+ − 582 // Implement last stop at 4m/5m/6m...
+ − 583 if( temp_depth_limit == 3 )
+ − 584 temp_depth_limit = char_I_depth_last_deco;
+ − 585 }
+ − 586 else
+ − 587 temp_depth_limit = 0;
+ − 588 }
+ − 589
+ − 590 //---- Check gas change --------------------------------------------------
+ − 591 need_stop |= gas_switch_deepest(); // Update temp_depth_limit if there is a change,
+ − 592
+ − 593 return need_stop;
+ − 594 }
+ − 595
+ − 596 //////////////////////////////////////////////////////////////////////////////
+ − 597 // copy_deco_table
+ − 598 //
+ − 599 // Buffer the stops, once computed, so we can continue to display them
+ − 600 // while computing the next set.
+ − 601 //
+ − 602 static void copy_deco_table(void)
+ − 603 {
+ − 604 // Copy depth of the first (deepest) stop, because when reversing
+ − 605 // order, it will be hard to find...
111
+ − 606 char_O_first_deco_depth = internal_deco_depth[0];
0
+ − 607 char_O_first_deco_time = internal_deco_time [0];
+ − 608
+ − 609 {
+ − 610 overlay unsigned char x, y;
+ − 611
+ − 612 for(x=0; x<NUM_STOPS; x++)
+ − 613 {
+ − 614 char_O_deco_depth[x] = internal_deco_depth[x];
+ − 615 char_O_deco_time [x] = internal_deco_time [x];
111
+ − 616 char_O_deco_gas [x] = internal_deco_gas [x];
0
+ − 617 }
+ − 618
+ − 619 //Now fill the char_O_deco_time_for_log array
+ − 620 //---- First: search the first non-null depth
+ − 621 for(x=(NUM_STOPS-1); x != 0; --x)
+ − 622 if( internal_deco_depth[x] != 0 ) break;
+ − 623
+ − 624 //---- Second: copy to output table (in reverse order)
+ − 625 for(y=0; y<NUM_STOPS; y++, --x)
+ − 626 {
+ − 627 char_O_deco_time_for_log[y] = internal_deco_time [x];
+ − 628
+ − 629 // Stop only once the last transfer is done.
+ − 630 if( x == 0 ) break;
+ − 631 }
+ − 632
+ − 633 //---- Third: fill table end with null
+ − 634 for(y++; y<NUM_STOPS; y++)
+ − 635 {
+ − 636 char_O_deco_time_for_log [y] = 0;
111
+ − 637 char_O_deco_gas [y] = 0;
0
+ − 638 }
+ − 639 }
+ − 640 }
+ − 641
+ − 642 //////////////////////////////////////////////////////////////////////////////
+ − 643 // temp_tissue_safety //
+ − 644 //
+ − 645 // outsourced in v.102
+ − 646 //
+ − 647 // Apply safety factors for brand ZH-L16 model.
+ − 648 //
+ − 649 static void temp_tissue_safety(void)
+ − 650 {
+ − 651 assert( 0.0 < float_desaturation_multiplier && float_desaturation_multiplier <= 1.0 );
+ − 652 assert( 1.0 <= float_saturation_multiplier && float_saturation_multiplier <= 2.0 );
+ − 653
+ − 654 if( char_I_deco_model == 0 )
+ − 655 {
+ − 656 if( temp_tissue < 0.0 )
+ − 657 temp_tissue *= float_desaturation_multiplier;
+ − 658 else
+ − 659 temp_tissue *= float_saturation_multiplier;
+ − 660 }
+ − 661 }
+ − 662
+ − 663 //////////////////////////////////////////////////////////////////////////////
+ − 664 //////////////////////////////////////////////////////////////////////////////
+ − 665 // ** THE JUMP-IN CODE **
+ − 666 // ** for the asm code **
+ − 667 //////////////////////////////////////////////////////////////////////////////
+ − 668 //////////////////////////////////////////////////////////////////////////////
+ − 669
+ − 670 //////////////////////////////////////////////////////////////////////////////
+ − 671 // Called every 2 seconds during diving.
+ − 672 // update tissues every time.
+ − 673 //
+ − 674 // Every 6 seconds (or slower when TTS > 16):
+ − 675 // - update deco table (char_O_deco_time/depth) with new values.
+ − 676 // - update ascent time,
+ − 677 // - set status to zero (so we can check there is new results).
+ − 678 //
+ − 679 void deco_calc_hauptroutine(void)
+ − 680 {
+ − 681 RESET_C_STACK
+ − 682 calc_hauptroutine();
+ − 683 int_O_desaturation_time = 65535;
+ − 684 }
+ − 685
+ − 686 //////////////////////////////////////////////////////////////////////////////
+ − 687 // Reset decompression model:
+ − 688 // + Set all tissues to equilibrium with Air at ambient pressure.
+ − 689 // + Reset last stop to 0m
+ − 690 // + Reset all model output.
+ − 691 void deco_clear_tissue(void)
+ − 692 {
+ − 693 RESET_C_STACK
+ − 694 clear_tissue();
+ − 695 }
+ − 696
+ − 697 //////////////////////////////////////////////////////////////////////////////
+ − 698 // Called every 1 min during decoplanning.
+ − 699 // Update tissues for 1 min.
+ − 700 //
+ − 701 void deco_calc_tissue(void)
+ − 702 {
+ − 703 RESET_C_STACK
+ − 704 calc_hauptroutine_update_tissues();
+ − 705 }
+ − 706
+ − 707 //////////////////////////////////////////////////////////////////////////////
+ − 708
+ − 709 void deco_calc_wo_deco_step_1_min(void)
+ − 710 {
+ − 711 RESET_C_STACK
+ − 712 calc_wo_deco_step_1_min();
+ − 713 deco_calc_desaturation_time();
+ − 714 }
+ − 715
+ − 716 //////////////////////////////////////////////////////////////////////////////
+ − 717
+ − 718 void deco_calc_dive_interval(void)
+ − 719 {
+ − 720 RESET_C_STACK
+ − 721 calc_dive_interval();
+ − 722 }
+ − 723
+ − 724 //////////////////////////////////////////////////////////////////////////////
+ − 725 // Find current gas in the list (if any).
+ − 726 //
+ − 727 // Input: char_I_current_gas = 1..6
+ − 728 //
+ − 729 // Output: sim_gas_last_depth = 0..5, temp_depth_limit.
+ − 730 //
+ − 731 static void gas_switch_find_current(void)
+ − 732 {
+ − 733 assert( 0 < char_I_current_gas && char_I_current_gas <= (NUM_GAS+1) );
+ − 734
+ − 735 if( char_I_current_gas <= NUM_GAS ) // Gas1..Gas5
+ − 736 {
+ − 737 sim_gas_last_used = char_I_current_gas;
+ − 738
+ − 739 // Note: if current is first gas, we must find it, but not set
+ − 740 // last depth change to surface.
+ − 741 if( char_I_deco_gas_change[sim_gas_last_used-1] )
+ − 742 sim_gas_last_depth = char_I_deco_gas_change[sim_gas_last_used-1];
+ − 743 }
+ − 744 else
+ − 745 sim_gas_last_used = 0; // Gas 6 = manual set
+ − 746 }
+ − 747
+ − 748 //////////////////////////////////////////////////////////////////////////////
+ − 749 // Find deepest available gas.
+ − 750 //
+ − 751 // Input: temp_depth_limit,
+ − 752 // deco_gas_change[]
+ − 753 // sim_gas_depth_used, sim_dive_mins.
+ − 754 //
+ − 755 // RETURNS TRUE if a stop is needed for gas switch.
+ − 756 //
+ − 757 // Output: temp_depth_limit, sim_gas_depth_used IFF the is a switch.
+ − 758 //
+ − 759 // NOTE: might be called from bottom (when sim_gas_delay and sim_gas_depth_used
+ − 760 // are null), or during the ascent to make sure we are not passing a
+ − 761 // stop (in which case both can be already set).
+ − 762 //
+ − 763 static unsigned char gas_switch_deepest(void)
+ − 764 {
+ − 765 overlay unsigned char switch_deco = 0, switch_last = 0;
+ − 766
+ − 767 if (char_I_const_ppO2 == 0)
+ − 768 {
+ − 769 overlay unsigned char j;
+ − 770
+ − 771 // Loop over all enabled gas, to find the deepest one,
+ − 772 // above last used gas, but below temp_depth_limit.
+ − 773 for(j=0; j<NUM_GAS; ++j)
+ − 774 {
+ − 775 // Gas not (yet) allowed ? Skip !
+ − 776 if( temp_depth_limit > deco_gas_change[j] )
+ − 777 continue;
+ − 778
+ − 779 // Gas deeper (or equal) than the current one ? Skip !
+ − 780 if( sim_gas_last_depth && deco_gas_change[j] >= sim_gas_last_depth )
+ − 781 continue;
+ − 782
+ − 783 // First, or deeper ?
+ − 784 if( switch_deco < deco_gas_change[j] )
+ − 785 {
+ − 786 switch_deco = deco_gas_change[j];
+ − 787 switch_last = j+1; // 1..5
+ − 788 }
+ − 789 }
+ − 790 }
+ − 791
+ − 792 // If there is a better gas available
+ − 793 if( switch_deco )
+ − 794 {
+ − 795 assert( !sim_gas_last_depth || sim_gas_last_depth > switch_deco );
+ − 796
+ − 797 sim_gas_last_depth = switch_deco;
+ − 798 sim_gas_last_used = switch_last;
+ − 799 return 0;
+ − 800 }
+ − 801 return 0;
+ − 802 }
+ − 803
+ − 804 //////////////////////////////////////////////////////////////////////////////
+ − 805 // Calculate gas switches
+ − 806 //
+ − 807 //
+ − 808 // Input: N2_ratio, He_ratio.
+ − 809 // sim_gas_last_used
+ − 810 //
+ − 811 // Output: calc_N2_ratio, calc_He_ratio
+ − 812 //
+ − 813 static void gas_switch_set(void)
+ − 814 {
+ − 815 assert( sim_gas_last_used <= NUM_GAS );
+ − 816
+ − 817 if( sim_gas_last_used == 0 ) // Gas6 = manualy set gas.
+ − 818 {
+ − 819 calc_N2_ratio = N2_ratio;
+ − 820 calc_He_ratio = He_ratio;
+ − 821 }
+ − 822 else
+ − 823 {
+ − 824 calc_N2_ratio = char_I_deco_N2_ratio[sim_gas_last_used-1] * 0.01;
+ − 825 calc_He_ratio = char_I_deco_He_ratio[sim_gas_last_used-1] * 0.01;
+ − 826 }
+ − 827
+ − 828 assert( 0.0 <= calc_N2_ratio && calc_N2_ratio <= 0.95 );
114
+ − 829 assert( 0.0 <= calc_He_ratio && calc_He_ratio <= 1.00 );
0
+ − 830 assert( (calc_N2_ratio + calc_He_ratio) <= 1.00 );
+ − 831 }
+ − 832
+ − 833 //////////////////////////////////////////////////////////////////////////////
+ − 834 //
+ − 835 // Input: calc_N2_ratio, calc_He_ratio : simulated gas mix.
+ − 836 // temp_deco : simulated respiration pressure
+ − 837 // float_deco_distance : security factor.
+ − 838 // Water-vapor pressure inside limbs (ppWater).
+ − 839 //
+ − 840 // Output: ppN2, ppHe.
+ − 841 //
+ − 842 static void sim_alveolar_presures(void)
+ − 843 {
+ − 844 overlay float deco_diluent = temp_deco; // new in v.101
+ − 845
+ − 846 // Take deco offset into account, but not at surface.
+ − 847 // Note: this should be done on ambiant pressure, hence before
+ − 848 // computing the diluant partial pressure...
+ − 849 if( deco_diluent > pres_surface )
+ − 850 deco_diluent += float_deco_distance;
+ − 851
+ − 852 //---- CCR mode : deco gas switch ? --------------------------------------
+ − 853 if( char_I_const_ppO2 != 0 )
+ − 854 {
+ − 855 // In CCR mode, use calc_XX_ratio instead of XX_ratio.
+ − 856 // Note: PPO2 and ratios are known outside the lumbs, so there is no
+ − 857 // ppWater in the equations below:
+ − 858 deco_diluent -= const_ppO2;
+ − 859 deco_diluent /= calc_N2_ratio + calc_He_ratio;
+ − 860
+ − 861 if (deco_diluent > temp_deco)
+ − 862 deco_diluent = temp_deco;
+ − 863 }
+ − 864
+ − 865 if( deco_diluent > ppWater )
+ − 866 {
+ − 867 ppN2 = calc_N2_ratio * (deco_diluent - ppWater);
+ − 868 ppHe = calc_He_ratio * (deco_diluent - ppWater);
+ − 869 }
+ − 870 else
+ − 871 {
+ − 872 ppN2 = 0.0;
+ − 873 ppHe = 0.0;
+ − 874 }
+ − 875 assert( 0.0 <= ppN2 && ppN2 < 14.0 );
+ − 876 assert( 0.0 <= ppHe && ppHe < 14.0 );
+ − 877 }
+ − 878
+ − 879 //////////////////////////////////////////////////////////////////////////////
+ − 880 // clear_tissue
+ − 881 //
+ − 882 // optimized in v.101 (var_N2_a)
+ − 883 //
+ − 884 // preload tissues with standard pressure for the given ambient pressure.
+ − 885 // Note: fixed N2_ratio for standard air.
+ − 886 //
+ − 887 static void clear_tissue(void)
+ − 888 {
+ − 889 overlay float p;
+ − 890
+ − 891 // Kludge: the 0.0002 of 0.7902 are missing with standard air.
+ − 892 N2_ratio = 0.7902;
+ − 893 pres_respiration = int_I_pres_respiration * 0.001;
+ − 894
+ − 895 p = N2_ratio * (pres_respiration - ppWater);
+ − 896 for(ci=0; ci<NUM_COMP; ci++)
+ − 897 {
+ − 898 // cycle through the 16 Bühlmann N2 tissues
+ − 899 pres_tissue_N2[ci] = p;
+ − 900
+ − 901 // cycle through the 16 Bühlmann tissues for Helium
+ − 902 pres_tissue_He[ci] = 0.0;
+ − 903 }
+ − 904
+ − 905 clear_deco_table();
+ − 906 char_O_deco_status = 0;
+ − 907 char_O_nullzeit = 0;
+ − 908 int_O_ascenttime = 0;
+ − 909 char_O_gradient_factor = 0;
+ − 910 char_O_relative_gradient_GF = 0;
+ − 911
+ − 912 calc_lead_tissue_limit = 0.0;
+ − 913 char_O_gtissue_no = 0;
+ − 914 }
+ − 915
+ − 916 //////////////////////////////////////////////////////////////////////////////
+ − 917 // calc_hauptroutine
+ − 918 //
+ − 919 // this is the major code in dive mode calculates:
+ − 920 // the tissues,
+ − 921 // the bottom time,
+ − 922 // and simulates the ascend with all deco stops.
+ − 923 //
+ − 924 // The deco_state sequence is :
+ − 925 // 3 (at surface)
+ − 926 // +---> 0 : calc nullzeit
+ − 927 // | 2 : simulate ascent to first stop (at 10m/min, less that 16x 1min simu)
+ − 928 // | +-> 1 : simulate up to 16min of stops.
+ − 929 // | +------< not finished
+ − 930 // +--------< finish
+ − 931 //
+ − 932 // Added steps 6,5 for @+5 calculation:
+ − 933 // 6 = ascent to first stop (same as 2), except continue to 7
+ − 934 // 7 = same as 1, except loop to 7.
+ − 935 //
+ − 936 static void calc_hauptroutine(void)
+ − 937 {
+ − 938 static unsigned char backup_gas_used;
+ − 939 static unsigned char backup_gas_depth;
+ − 940
+ − 941 calc_hauptroutine_data_input();
+ − 942
+ − 943 calc_hauptroutine_update_tissues();
+ − 944 calc_gradient_factor();
+ − 945
+ − 946 // toggle between calculation for nullzeit (bottom time),
+ − 947 // deco stops
+ − 948 // and more deco stops (continue)
+ − 949 switch( char_O_deco_status )
+ − 950 {
+ − 951 case 3: //---- At surface: start a new dive ------------------------------
+ − 952 clear_deco_table();
+ − 953 copy_deco_table();
+ − 954 int_O_ascenttime = 0; // Reset DTR.
+ − 955 int_O_extra_ascenttime = 0;
+ − 956 char_O_nullzeit = 0; // Reset bottom time.
+ − 957 char_O_deco_status = 0; // Calc bottom-time/nullzeit next iteration.
+ − 958
+ − 959 // Values that should be reset just once for the full real dive.
+ − 960 // This is used to record the lowest stop for the whole dive,
+ − 961 // Including ACCROSS all simulated ascent.
+ − 962 low_depth = 0;
+ − 963 locked_GF_step = 0.0;
+ − 964
+ − 965 // Reset gas switch history.
+ − 966 backup_gas_used = sim_gas_last_used = 0;
+ − 967 backup_gas_depth = sim_gas_last_depth = 0;
+ − 968 sim_dive_mins = 0;
+ − 969 break;
+ − 970
+ − 971 case 0: //---- bottom time -----------------------------------------------
+ − 972 default:
+ − 973 gas_switch_find_current(); // Lookup for current gas & time.
+ − 974 gas_switch_set(); // setup calc_ratio's
+ − 975
+ − 976 calc_nullzeit();
+ − 977 if( char_O_nullzeit > 0 ) // Some NDL time left ?
+ − 978 {
+ − 979 char_O_deco_status = 0; // YES: recalc ndl next time.
+ − 980 clear_deco_table(); // Also clear stops !
+ − 981 copy_deco_table();
+ − 982 char_O_deco_last_stop = 0; // And last stop (OSTC menu anim)
+ − 983 }
+ − 984 else
+ − 985 char_O_deco_status = 2; // NO: calc ascent next time.
+ − 986 break;
+ − 987
+ − 988 case 2: //---- Simulate ascent to first stop -----------------------------
+ − 989 case 6: // @+5min variation
+ − 990 // Check proposed gas at begin of ascent simulation
+ − 991 sim_dive_mins = int_I_divemins; // Init current time.
+ − 992
+ − 993 gas_switch_find_current(); // Lookup for current gas & time.
+ − 994 gas_switch_set(); // setup calc_ratio's
+ − 995
+ − 996 backup_gas_used = sim_gas_last_used; // And save for later simu steps.
+ − 997 backup_gas_depth = sim_gas_last_depth; // And save for later simu steps.
+ − 998
+ − 999 sim_ascent_to_first_stop();
+ − 1000
+ − 1001 // Calc stops next time (deco or gas switch).
+ − 1002 char_O_deco_status = 1 | ( char_O_deco_status & 4 );
+ − 1003 break;
+ − 1004
+ − 1005 case 1: //---- Simulate stops --------------------------------------------
+ − 1006 case 5: // @+5 variation.
+ − 1007 calc_hauptroutine_calc_deco();
+ − 1008
+ − 1009 // If simulation is finished, restore the GF low reference, so that
+ − 1010 // next ascent simulation is done from the current depth:
+ − 1011 if( (char_O_deco_status & 3) == 0 )
+ − 1012 {
+ − 1013 sim_gas_last_used = backup_gas_used;
+ − 1014 sim_gas_last_depth = backup_gas_depth;
+ − 1015 }
+ − 1016 break;
+ − 1017 }
+ − 1018 }
+ − 1019
+ − 1020 //////////////////////////////////////////////////////////////////////////////
+ − 1021 // calc_hauptroutine_data_input
+ − 1022 //
+ − 1023 // Reset all C-code dive parameters from their ASM-code values.
+ − 1024 // Detect gas change condition.
+ − 1025 //
+ − 1026 void calc_hauptroutine_data_input(void)
+ − 1027 {
+ − 1028 overlay short int_temp;
+ − 1029 overlay unsigned char g;
+ − 1030
+ − 1031 pres_respiration = int_I_pres_respiration * 0.001;
+ − 1032 pres_surface = int_I_pres_surface * 0.001;
+ − 1033 N2_ratio = char_I_N2_ratio * 0.01;
+ − 1034 He_ratio = char_I_He_ratio * 0.01;
+ − 1035 float_deco_distance = char_I_deco_distance * 0.01; // Get offset is in mbar.
+ − 1036
+ − 1037 // ____________________________________________________
+ − 1038 //
+ − 1039 // _____________ G A S _ C H A N G E S ________________
+ − 1040 // ____________________________________________________
+ − 1041
+ − 1042 // Keep a margin of 150mbar = 1.50m
+ − 1043 int_temp = (int_I_pres_respiration - int_I_pres_surface)
+ − 1044 + MBAR_REACH_GASCHANGE_AUTO_CHANGE_OFF;
+ − 1045
+ − 1046 // Gas are selectable if we did not pass the change depth by more than 1.50m:
+ − 1047 for(g=0; g < NUM_GAS; ++g)
+ − 1048 {
+ − 1049 deco_gas_change[g] = 0;
+ − 1050 if(char_I_deco_gas_change[g])
+ − 1051 if( int_temp > 100 *(short)char_I_deco_gas_change[g] )
+ − 1052 deco_gas_change[g] = char_I_deco_gas_change[g];
+ − 1053 }
+ − 1054
+ − 1055 const_ppO2 = char_I_const_ppO2 * 0.01;
+ − 1056 float_desaturation_multiplier = char_I_desaturation_multiplier * 0.01;
+ − 1057 float_saturation_multiplier = char_I_saturation_multiplier * 0.01;
+ − 1058 GF_low = char_I_GF_Low_percentage * 0.01;
+ − 1059 GF_high = char_I_GF_High_percentage * 0.01;
+ − 1060 GF_delta = GF_high - GF_low;
+ − 1061 }
+ − 1062
+ − 1063 //////////////////////////////////////////////////////////////////////////////
+ − 1064 //
+ − 1065 //
+ − 1066 void calc_hauptroutine_update_tissues(void)
+ − 1067 {
+ − 1068 assert( 0.00 <= N2_ratio && N2_ratio <= 1.00 );
+ − 1069 assert( 0.00 <= He_ratio && He_ratio <= 1.00 );
114
+ − 1070 assert( (N2_ratio + He_ratio) <= 1.00 );
0
+ − 1071 assert( 0.800 < pres_respiration && pres_respiration < 14.0 );
+ − 1072
+ − 1073 pres_diluent = pres_respiration;
+ − 1074 if( char_I_const_ppO2 != 0 )
+ − 1075 {
+ − 1076 overlay float flush_ppO2 = pres_respiration * (1.0 - N2_ratio - He_ratio);
+ − 1077
+ − 1078 pres_diluent -= const_ppO2;
+ − 1079 pres_diluent /= N2_ratio + He_ratio;
+ − 1080 if( pres_diluent < 0.0 )
+ − 1081 pres_diluent = 0.0;
+ − 1082 if( pres_diluent > pres_respiration )
+ − 1083 pres_diluent = pres_respiration;
+ − 1084
+ − 1085 char_O_diluent = (unsigned char)(pres_diluent/pres_respiration*100.0 + 0.5);
+ − 1086
+ − 1087 if( flush_ppO2 > 2.545) flush_ppO2 = 2.55;
+ − 1088 if( flush_ppO2 < 0.0 ) flush_ppO2 = 0.0;
+ − 1089 char_O_flush_ppO2 = (unsigned char)(flush_ppO2*100.0 + 0.5);
+ − 1090 }
+ − 1091
+ − 1092 if( pres_diluent > ppWater )
+ − 1093 {
+ − 1094 overlay float EAD, END;
+ − 1095
+ − 1096 ppN2 = N2_ratio * (pres_diluent - ppWater);
+ − 1097 ppHe = He_ratio * (pres_diluent - ppWater);
+ − 1098
+ − 1099 // EAD : Equivalent Air Dive. Equivalent depth for the same N2 level
+ − 1100 // with plain air.
+ − 1101 // ppN2 = 79% * (P_EAD - ppWater)
+ − 1102 // EAD = (P_EAD - Psurface) * 10
+ − 1103 // ie: EAD = (ppN2 / 0.7902 + ppWater -Psurface) * 10
+ − 1104 EAD = (ppN2 / 0.7902 + ppWater - pres_surface) * BAR_TO_METER;
+ − 1105 if( EAD < 0.0 || EAD > 245.5 ) EAD = 0.0;
+ − 1106 char_O_EAD = (unsigned char)(EAD + 0.5);
+ − 1107
+ − 1108 // END : Equivalent Narcotic Dive.
+ − 1109 // Here we count O2 as narcotic too. Hence everything but helium (has a narcosis factor of
+ − 1110 // 0.23 btw). Hence the formula becomes:
+ − 1111 // END * BarPerMeter * (1.0 - 0.0) - ppWater + Psurface == Pambient - ppHe - ppWater
+ − 1112 // ie: END = (Pambient - ppHe - Psurface) * BAR_TO_METER
+ − 1113 //
+ − 1114 // Source cited:
+ − 1115 // The Physiology and Medicine of Diving by Peter Bennett and David Elliott,
+ − 1116 // 4th edition, 1993, W.B.Saunders Company Ltd, London.
+ − 1117 END = (pres_respiration - ppHe - pres_surface) * BAR_TO_METER;
+ − 1118 if( END < 0.0 || END > 245.5 ) END = 0.0;
+ − 1119 char_O_END = (unsigned char)(END + 0.5);
+ − 1120 }
+ − 1121 else // new in v.101
+ − 1122 {
+ − 1123 ppN2 = 0.0;
+ − 1124 ppHe = 0.0;
+ − 1125 char_O_EAD = char_O_END = 0;
+ − 1126 }
+ − 1127
+ − 1128 if(!char_I_step_is_1min)
+ − 1129 calc_tissue(0);
+ − 1130 else
+ − 1131 calc_tissue(1);
+ − 1132
+ − 1133 // Calc limit for surface, ie. GF_high.
+ − 1134 calc_limit();
+ − 1135
126
+ − 1136 // Fill int_O_ceiling if ceiling is below the surface
+ − 1137 if ((calc_lead_tissue_limit-pres_surface)>0)
+ − 1138 int_O_ceiling = (short)((calc_lead_tissue_limit-pres_surface)*1000);
+ − 1139 else
+ − 1140 int_O_ceiling = 0;
+ − 1141
0
+ − 1142 int_O_gtissue_press = (short)((pres_tissue_N2[char_O_gtissue_no] + pres_tissue_He[char_O_gtissue_no]) * 1000);
+ − 1143 }
+ − 1144
+ − 1145
+ − 1146 //////////////////////////////////////////////////////////////////////////////
+ − 1147 // Compute stops.
+ − 1148 //
+ − 1149 // Note: because this can be very long, break on 16 iterations, and set state
+ − 1150 // to 0 when finished, or to 1 when needing to continue.
+ − 1151 // Note: because each iteration might be very long too (~ 66 ms in 1.84beta),
+ − 1152 // break the loop when total time > 512msec.
+ − 1153 //
+ − 1154 void calc_hauptroutine_calc_deco(void)
+ − 1155 {
+ − 1156 overlay unsigned char loop;
+ − 1157
34
+ − 1158 for(loop = 0; loop < 16; ++loop)
0
+ − 1159 {
+ − 1160 // Limit loops to 512ms, using timer 5:
+ − 1161 if( tmr5() & (512*32) )
+ − 1162 break;
34
+ − 1163
0
+ − 1164 if( calc_nextdecodepth() )
+ − 1165 {
+ − 1166 if( temp_depth_limit == 0 )
+ − 1167 goto Surface;
+ − 1168
+ − 1169 //---- We hit a stop at temp_depth_limit ---------------------
+ − 1170 temp_deco = temp_depth_limit * METER_TO_BAR // Convert to relative bar,
+ − 1171 + pres_surface; // To absolute.
+ − 1172 if( !update_deco_table() ) // Adds a one minute stops.
+ − 1173 goto Surface; // Deco table full: abort...
+ − 1174 }
+ − 1175 else
+ − 1176 {
+ − 1177 //---- No stop -----------------------------------------------
+ − 1178 temp_deco -= (10*METER_TO_BAR); // Ascend 10m, no wait.
+ − 1179
+ − 1180 //---- Finish computations once surface is reached -----------
+ − 1181 if( temp_deco <= pres_surface )
+ − 1182 {
+ − 1183 Surface:
+ − 1184 if( char_O_deco_status == 1 ) // Don't in @+5min variant.
+ − 1185 copy_deco_table();
+ − 1186
+ − 1187 calc_ascenttime();
+ − 1188 char_O_deco_status = 0; // calc nullzeit next time.
+ − 1189 char_O_deco_last_stop = 0; // Surface reached (to animate menu)
+ − 1190 return;
+ − 1191 }
+ − 1192 }
+ − 1193 //---- Then update tissue --------------------------------------------
+ − 1194 sim_dive_mins++; // Advance simulated time by 1 minute.
+ − 1195 gas_switch_set(); // Apply any simulated gas change, once validated.
+ − 1196 sim_alveolar_presures(); // Updates ppN2 and ppHe.
+ − 1197 sim_tissue(1); // Simulate compartiments for 1 minute.
+ − 1198 }
+ − 1199
+ − 1200 // Surface not reached, need more stops... for menu animation.
+ − 1201 char_O_deco_last_stop = temp_depth_limit; // Reached depth.
+ − 1202 }
+ − 1203
+ − 1204
+ − 1205 //////////////////////////////////////////////////////////////////////////////
+ − 1206 // Simulation ascention to first deco stop.
+ − 1207 //
+ − 1208 // Note: because we ascent with a constant speed (10m/mn, ie. 1bar/mn),
+ − 1209 // there is no need to break on more that 16 iterations
+ − 1210 // (or we are already in deep shit).
+ − 1211 //
+ − 1212 // Input: pres_respiration
+ − 1213 // Output: temp_deco
+ − 1214 //
+ − 1215 // if char_O_deco_status indicate @+5 variant, add extra time at current depth,
+ − 1216 // before ascent.
+ − 1217 void sim_ascent_to_first_stop(void)
+ − 1218 {
+ − 1219 overlay unsigned char fast = 1; // 1min or 2sec steps.
+ − 1220
+ − 1221 update_startvalues();
+ − 1222 clear_deco_table();
+ − 1223
+ − 1224 temp_deco = pres_respiration; // Starts from current real depth.
+ − 1225
+ − 1226 // Are we doing the special @+5min variation ?
+ − 1227 if(char_O_deco_status & 4)
+ − 1228 sim_extra_time();
+ − 1229
+ − 1230 //---- Loop until first stop, gas switch, or surface is reached ----------
+ − 1231 for(;;)
+ − 1232 {
+ − 1233 overlay float old_deco = temp_deco; // Pamb backup (bars)
+ − 1234
+ − 1235 // Try ascending 1 full minute (fast) or 2sec (!fast):
+ − 1236 if( fast )
+ − 1237 temp_deco -= 10*METER_TO_BAR; // 1 min, at 10m/min. ~ 1bar.
+ − 1238 else
+ − 1239 temp_deco -= (10.0/30.0)*METER_TO_BAR; // 2sec at 10m/min.
+ − 1240
+ − 1241 if( temp_deco < pres_surface ) // But don't go over surface.
+ − 1242 temp_deco = pres_surface;
+ − 1243
+ − 1244 // Recompute sim_lead_tissue_limit at GF_low (deepest stop), because
+ − 1245 // one minute passed.
+ − 1246 sim_limit(GF_low);
+ − 1247
+ − 1248 // Did we reach deepest remaining stop ?
+ − 1249 if( temp_deco < sim_lead_tissue_limit )
+ − 1250 {
+ − 1251 temp_deco = old_deco; // Restore last correct depth,
+ − 1252
+ − 1253 if( fast )
+ − 1254 {
+ − 1255 fast = 0; // Retry with 2sec steps.
+ − 1256 continue;
+ − 1257 }
+ − 1258 else
+ − 1259 break; // Done...
+ − 1260 }
+ − 1261
+ − 1262 // Did we reach surface ?
+ − 1263 // NOTE: we should round BEFORE checking surface is reached.
+ − 1264 temp_depth_limit = (unsigned char)(0.5 + (temp_deco - pres_surface) * BAR_TO_METER);
+ − 1265 if( temp_depth_limit == 0 )
+ − 1266 {
+ − 1267 temp_deco = pres_surface; // Yes: finished !
+ − 1268 break;
+ − 1269 }
+ − 1270
+ − 1271 // Check for gas change below new depth ?
+ − 1272 if( gas_switch_deepest() )
+ − 1273 {
+ − 1274 assert( temp_depth_limit > 0);
+ − 1275
+ − 1276 temp_deco = temp_depth_limit * METER_TO_BAR + pres_surface;
+ − 1277 break;
+ − 1278 }
+ − 1279
+ − 1280 if( fast )
+ − 1281 sim_dive_mins++; // Advance simulated time by 1 minute.
+ − 1282 sim_alveolar_presures(); // temp_deco --> ppN2/ppHe
+ − 1283 sim_tissue(fast); // and update tissues for 1 min.
+ − 1284 }
+ − 1285 }
+ − 1286
+ − 1287 //////////////////////////////////////////////////////////////////////////////
+ − 1288 // Simulation extra time at the current depth.
+ − 1289 //
+ − 1290 // This routine is used for @+5min feature.
+ − 1291 void sim_extra_time(void)
+ − 1292 {
+ − 1293 overlay unsigned char extra = char_I_extra_time;
+ − 1294 do {
+ − 1295 sim_dive_mins++; // Advance simulated time by 1 minute.
+ − 1296 sim_tissue(1); // and update tissues for 1 min.
+ − 1297 } while( --extra != 0 );
+ − 1298 }
+ − 1299
+ − 1300 //////////////////////////////////////////////////////////////////////////////
+ − 1301 // calc_tissue
+ − 1302 //
+ − 1303 // optimized in v.101
+ − 1304 //
+ − 1305 static void calc_tissue(PARAMETER unsigned char period)
+ − 1306 {
+ − 1307 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m
+ − 1308 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m
+ − 1309
+ − 1310 for (ci=0;ci<NUM_COMP;ci++)
+ − 1311 {
+ − 1312 read_buhlmann_times(period); // 2 sec or 1 min period.
+ − 1313
+ − 1314 // N2
+ − 1315 temp_tissue = (ppN2 - pres_tissue_N2[ci]) * var_N2_e;
+ − 1316 temp_tissue_safety();
+ − 1317 pres_tissue_N2[ci] += temp_tissue;
+ − 1318
+ − 1319 // He
+ − 1320 temp_tissue = (ppHe - pres_tissue_He[ci]) * var_He_e;
+ − 1321 temp_tissue_safety();
+ − 1322 pres_tissue_He[ci] += temp_tissue;
+ − 1323 }
+ − 1324 }
+ − 1325
+ − 1326 //////////////////////////////////////////////////////////////////////////////
+ − 1327 // calc_limit
+ − 1328 //
+ − 1329 // New in v.111 : separated from calc_tissue(), and depends on GF value.
+ − 1330 //
+ − 1331 static void calc_limit(void)
+ − 1332 {
+ − 1333 char_O_gtissue_no = 255;
+ − 1334 calc_lead_tissue_limit = 0.0;
+ − 1335
+ − 1336 for(ci=0; ci<NUM_COMP;ci++)
+ − 1337 {
+ − 1338 overlay float N2 = pres_tissue_N2[ci];
+ − 1339 overlay float He = pres_tissue_He[ci];
+ − 1340 overlay float p = N2 + He;
+ − 1341
+ − 1342 read_buhlmann_coefficients();
+ − 1343 var_N2_a = (var_N2_a * N2 + var_He_a * He) / p;
+ − 1344 var_N2_b = (var_N2_b * N2 + var_He_b * He) / p;
+ − 1345
+ − 1346 // Apply the Eric Baker's varying gradient factor correction.
+ − 1347 // Note: the correction factor depends both on GF and b,
+ − 1348 // Actual values are in the 1.5 .. 1.0 range (for a GF=30%),
+ − 1349 // so that can change who is the leading gas...
+ − 1350 // Note: Also depends of the GF. So the calcul is different for
+ − 1351 // GF_low, current GF, or GF_high...
+ − 1352 // *BUT* calc_tissue() is used to compute bottom time,
+ − 1353 // hence what would happend at surface,
+ − 1354 // hence at GF_high.
+ − 1355 if( char_I_deco_model != 0 )
+ − 1356 p = ( p - var_N2_a * GF_high) * var_N2_b
+ − 1357 / (GF_high + var_N2_b * (1.0 - GF_high));
+ − 1358 else
+ − 1359 p = (p - var_N2_a) * var_N2_b;
+ − 1360 if( p < 0.0 ) p = 0.0;
+ − 1361
+ − 1362 if( p > calc_lead_tissue_limit )
+ − 1363 {
+ − 1364 char_O_gtissue_no = ci;
+ − 1365 calc_lead_tissue_limit = p;
+ − 1366 }
+ − 1367 }
+ − 1368
+ − 1369 assert( char_O_gtissue_no < NUM_COMP );
+ − 1370 assert( 0.0 <= calc_lead_tissue_limit && calc_lead_tissue_limit <= 14.0);
+ − 1371 }
+ − 1372
+ − 1373 //////////////////////////////////////////////////////////////////////////////
+ − 1374 // calc_nullzeit
+ − 1375 //
+ − 1376 // calculates the remaining bottom time
+ − 1377 //
+ − 1378 // NOTE: Erik Baker's closed formula works for Nitroxes. Trimix adds a second
+ − 1379 // exponential term to the M-value equation, making it impossible to
+ − 1380 // invert... So we have to make a fast-simu until we find a better way.
+ − 1381 //
+ − 1382 // Input: pres_respiration
+ − 1383 // Output: char_O_nullzeit
+ − 1384 //
+ − 1385 static void calc_nullzeit(void)
+ − 1386 {
+ − 1387 //---- Compute ppN2 and ppHe ---------------------------------------------
+ − 1388 temp_deco = pres_respiration;
+ − 1389 sim_alveolar_presures();
+ − 1390
+ − 1391 char_O_nullzeit = 240;
+ − 1392 for(ci=0; ci<NUM_COMP; ci++)
+ − 1393 {
+ − 1394 //---- Read A/B values and loading factor for N2 and He --------------
+ − 1395 overlay float tN2 = pres_tissue_N2[ci];
+ − 1396 overlay float tHe = pres_tissue_He[ci];
+ − 1397 overlay float t = tN2 + tHe;
+ − 1398 overlay unsigned char ndl;
+ − 1399 overlay unsigned char period = 10;
+ − 1400
+ − 1401 read_buhlmann_coefficients();
+ − 1402 read_buhlmann_times(2); // Starts with a 10min period.
+ − 1403
+ − 1404 //---- Simulate for that tissue --------------------------------------
+ − 1405 // NOTE: No need to simulate for longuer than the already found NDL.
+ − 1406 for(ndl=0; ndl<char_O_nullzeit;)
+ − 1407 {
+ − 1408 //---- Compute updated mix M-value at surface
+ − 1409 overlay float a = (var_N2_a * tN2 + var_He_a * tHe) / t;
+ − 1410 overlay float b = (var_N2_b * tN2 + var_He_b * tHe) / t;
+ − 1411 overlay float M0 = (a + pres_surface/b);
+ − 1412
+ − 1413 //---- Add 10min/1min to N2/He tissues
+ − 1414 overlay float dTN2 = (ppN2 - tN2) * var_N2_e;
+ − 1415 overlay float dTHe = (ppHe - tHe) * var_He_e;
+ − 1416
+ − 1417 //---- Apply security margin when using the non-GF model
+ − 1418 if( char_I_deco_model == 0 )
+ − 1419 {
+ − 1420 dTN2 *= float_saturation_multiplier;
+ − 1421 dTHe *= float_saturation_multiplier;
+ − 1422 }
+ − 1423 else // Or GF-based model
+ − 1424 M0 = GF_high * (M0 - pres_surface) + pres_surface;
+ − 1425
+ − 1426 //---- Simulate off-gasing while going to surface
+ − 1427 // TODO !
+ − 1428 // dTN2 -= exp( ... ascent time ... ppN2...)
+ − 1429 // dTHe -= exp( ... ascent time ... ppHe...)
+ − 1430
+ − 1431 //---- Ok now, and still ok to surface after 1 or 10 minutes ?
+ − 1432 if( (t <= M0) && (t + dTN2 + dTHe <= M0) )
+ − 1433 {
+ − 1434 tN2 += dTN2; // YES: apply gas loadings,
+ − 1435 tHe += dTHe;
+ − 1436 t = tN2 + tHe;
+ − 1437 ndl += period; // increment NDL,
+ − 1438 continue; // and loop.
+ − 1439 }
+ − 1440
+ − 1441 //---- Should we retry with smaller steps ?
+ − 1442 if( period == 10 )
+ − 1443 {
+ − 1444 read_buhlmann_times(1); // 1min coefs.
+ − 1445 period = 1;
+ − 1446 continue;
+ − 1447 }
+ − 1448
+ − 1449 //---- ELSE make a linear approx for the last minute
+ − 1450 // Usefull to have a meaningfull rounding of NDL.
+ − 1451 // But ONLY it positive (negativ casted to unsigned is bad).
+ − 1452 if( M0 > t )
+ − 1453 ndl += (unsigned char)(0.5f + (M0-t)/(dTN2+dTHe));
+ − 1454 break;
+ − 1455 }
+ − 1456
+ − 1457 // Keep the shortest NDL found
+ − 1458 if( ndl < char_O_nullzeit )
+ − 1459 char_O_nullzeit = ndl;
+ − 1460 }
+ − 1461 }
+ − 1462
+ − 1463 //////////////////////////////////////////////////////////////////////////////
+ − 1464 // calc_ascenttime
+ − 1465 //
+ − 1466 // Summup ascent from bottom to surface, at 1 bar/min, 1min for last 3 meters,
+ − 1467 // and all stops.
+ − 1468 //
+ − 1469 // Result in int_O_ascenttime, or int_O_extra_ascenttime if in @+5min variant.
+ − 1470 static void calc_ascenttime(void)
+ − 1471 {
+ − 1472 overlay unsigned char x;
+ − 1473 overlay unsigned short sum;
+ − 1474
+ − 1475 // + 0.7 to count 1 minute ascent time from 3 metre to surface
+ − 1476 overlay float ascent = pres_respiration - pres_surface + 0.7;
+ − 1477 if (ascent < 0.0)
+ − 1478 ascent = 0.0;
+ − 1479 sum = (unsigned short)(ascent + 0.99);
+ − 1480
+ − 1481 for(x=0; x<NUM_STOPS && internal_deco_depth[x]; x++)
+ − 1482 sum += (unsigned short)internal_deco_time[x];
+ − 1483
+ − 1484 if( char_O_deco_status == 1 )
+ − 1485 int_O_ascenttime = sum;
+ − 1486 else
+ − 1487 int_O_extra_ascenttime = sum;
+ − 1488
+ − 1489 if(int_O_ascenttime>999)
+ − 1490 int_O_ascenttime=999; // limit to 999'
+ − 1491 }
+ − 1492
+ − 1493 //////////////////////////////////////////////////////////////////////////////
+ − 1494 // update_startvalues
+ − 1495 //
+ − 1496 // updated in v.102
+ − 1497 //
+ − 1498 void update_startvalues(void)
+ − 1499 {
+ − 1500 overlay unsigned char x;
+ − 1501
+ − 1502 // Start ascent simulation with current tissue partial pressures.
+ − 1503 for(x=0; x<NUM_COMP; x++)
+ − 1504 {
+ − 1505 sim_pres_tissue_N2[x] = pres_tissue_N2[x];
+ − 1506 sim_pres_tissue_He[x] = pres_tissue_He[x];
+ − 1507 }
+ − 1508
+ − 1509 // No leading tissue (yet) for this ascent simulation.
+ − 1510 sim_lead_tissue_limit = 0.0;
+ − 1511 sim_lead_tissue_no = 255;
+ − 1512 }
+ − 1513
+ − 1514 //////////////////////////////////////////////////////////////////////////////
+ − 1515 // sim_tissue
+ − 1516 //
+ − 1517 // optimized in v.101
+ − 1518 //
+ − 1519 // Function very simular to calc_tissue, but:
+ − 1520 // + Use a 1min or 10min period.
+ − 1521 // + Do it on sim_pres_tissue, instead of pres_tissue.
+ − 1522 static void sim_tissue(PARAMETER unsigned char period)
+ − 1523 {
+ − 1524 assert( 0.00 <= ppN2 && ppN2 < 11.2 ); // 80% N2 at 130m
+ − 1525 assert( 0.00 <= ppHe && ppHe < 12.6 ); // 90% He at 130m
+ − 1526
+ − 1527 for(ci=0; ci<NUM_COMP; ci++)
+ − 1528 {
+ − 1529 read_buhlmann_times(period); // 1 or 10 minute(s) interval
+ − 1530
+ − 1531 // N2
+ − 1532 temp_tissue = (ppN2 - sim_pres_tissue_N2[ci]) * var_N2_e;
+ − 1533 temp_tissue_safety();
+ − 1534 sim_pres_tissue_N2[ci] += temp_tissue;
+ − 1535
+ − 1536 // He
+ − 1537 temp_tissue = (ppHe - sim_pres_tissue_He[ci]) * var_He_e;
+ − 1538 temp_tissue_safety();
+ − 1539 sim_pres_tissue_He[ci] += temp_tissue;
+ − 1540 }
+ − 1541 }
+ − 1542
+ − 1543 //////////////////////////////////////////////////////////////////////////////
+ − 1544 // sim_limit()
+ − 1545 //
+ − 1546 // New in v.111
+ − 1547 //
+ − 1548 // Function separated from sim_tissue() to allow recomputing limit on
+ − 1549 // different depth, because it depends on current gradient factor.
+ − 1550 //
+ − 1551 static void sim_limit(PARAMETER float GF_current)
+ − 1552 {
+ − 1553 assert( 0.0 < GF_current && GF_current <= 1.0f);
+ − 1554
+ − 1555 sim_lead_tissue_limit = 0.0;
+ − 1556 sim_lead_tissue_no = 0; // If no one is critic, keep first tissue.
+ − 1557
+ − 1558 for(ci=0; ci<NUM_COMP; ci++)
+ − 1559 {
+ − 1560 overlay float N2 = sim_pres_tissue_N2[ci];
+ − 1561 overlay float He = sim_pres_tissue_He[ci];
+ − 1562 overlay float p = N2 + He;
+ − 1563
+ − 1564 read_buhlmann_coefficients();
+ − 1565 var_N2_a = (var_N2_a * N2 + var_He_a * He) / p;
+ − 1566 var_N2_b = (var_N2_b * N2 + var_He_b * He) / p;
+ − 1567
+ − 1568 // Apply the Eric Baker's varying gradient factor correction.
+ − 1569 // Note: the correction factor depends both on GF and b,
+ − 1570 // Actual values are in the 1.5 .. 1.0 range (for a GF=30%),
+ − 1571 // so that can change who is the leading gas...
+ − 1572 // Note: Also depends of the GF_current...
+ − 1573 if( char_I_deco_model != 0 )
+ − 1574 p = ( p - var_N2_a * GF_current)
+ − 1575 / (GF_current / var_N2_b + 1.0 - GF_current);
+ − 1576 else
+ − 1577 p = (p - var_N2_a) * var_N2_b;
+ − 1578 if( p < 0.0 ) p = 0.0;
+ − 1579
+ − 1580 if( p > sim_lead_tissue_limit )
+ − 1581 {
+ − 1582 sim_lead_tissue_no = ci;
+ − 1583 sim_lead_tissue_limit = p;
+ − 1584 }
+ − 1585 } // for ci
+ − 1586
+ − 1587 assert( sim_lead_tissue_no < NUM_COMP );
+ − 1588 assert( 0.0 <= sim_lead_tissue_limit && sim_lead_tissue_limit <= 14.0 );
+ − 1589 }
+ − 1590
+ − 1591 //////////////////////////////////////////////////////////////////////////////
+ − 1592 // clear_deco_table
+ − 1593 //
+ − 1594 // unchanged in v.101
+ − 1595 //
+ − 1596 static void clear_deco_table(void)
+ − 1597 {
+ − 1598 overlay unsigned char x;
+ − 1599
+ − 1600 for(x=0; x<NUM_STOPS; ++x)
+ − 1601 {
+ − 1602 internal_deco_time [x] = 0;
+ − 1603 internal_deco_depth[x] = 0;
+ − 1604 }
+ − 1605 }
+ − 1606
+ − 1607 //////////////////////////////////////////////////////////////////////////////
+ − 1608 // update_deco_table
+ − 1609 //
+ − 1610 // Add 1 min to current stop.
+ − 1611 //
+ − 1612 // Inputs:
+ − 1613 // temp_depth_limit = stop's depth, in meters.
+ − 1614 // In/Out:
+ − 1615 // internal_deco_depth[] : depth (in metres) of each stops.
+ − 1616 // internal_deco_time [] : time (in minutes) of each stops.
+ − 1617 //
+ − 1618 static unsigned char update_deco_table()
+ − 1619 {
+ − 1620 overlay unsigned char x;
+ − 1621 assert( temp_depth_limit < 128 ); // Can't be negativ (overflown).
+ − 1622 assert( temp_depth_limit > 0 ); // No stop at surface...
+ − 1623
+ − 1624 for(x=0; x<NUM_STOPS; ++x)
+ − 1625 {
+ − 1626 // Make sure deco-stops are recorded in order:
111
+ − 1627 assert( !internal_deco_depth[x] || temp_depth_limit <= internal_deco_depth[x] );
0
+ − 1628
111
+ − 1629 if( internal_deco_depth[x]== temp_depth_limit )
0
+ − 1630 {
+ − 1631 // Do not overflow (max 255')
+ − 1632 if( internal_deco_time[x] < 255 )
+ − 1633 {
+ − 1634 internal_deco_time[x]++;
+ − 1635 return 1;
+ − 1636 }
+ − 1637 // But store extra in the next stop...
+ − 1638 }
+ − 1639
+ − 1640 if( internal_deco_depth[x] == 0 )
+ − 1641 {
+ − 1642 internal_deco_depth[x] = temp_depth_limit;
+ − 1643
+ − 1644 internal_deco_time[x] = 1;
111
+ − 1645 internal_deco_gas[x] = sim_gas_last_used;
0
+ − 1646 return 1;
+ − 1647 }
+ − 1648 }
+ − 1649
+ − 1650 // Can't store stops at more than 96m.
+ − 1651 // Or stops at less that 3m too.
+ − 1652 // Just do nothing with that...
+ − 1653 return 0;
+ − 1654 }
+ − 1655
+ − 1656 //////////////////////////////////////////////////////////////////////////////
+ − 1657 // calc_gradient_factor
+ − 1658 //
+ − 1659 // optimized in v.101 (var_N2_a)
+ − 1660 // new code in v.102
+ − 1661 //
+ − 1662 static void calc_gradient_factor(void)
+ − 1663 {
+ − 1664 overlay float gf;
+ − 1665 overlay float N2 = pres_tissue_N2[char_O_gtissue_no];
+ − 1666 overlay float He = pres_tissue_He[char_O_gtissue_no];
+ − 1667
+ − 1668 assert( char_O_gtissue_no < NUM_COMP );
+ − 1669 assert( 0.800 <= pres_respiration && pres_respiration < 14.0 );
+ − 1670
+ − 1671 // tissue > respiration (currently off-gasing)
+ − 1672 // GF = 0% when respiration == tissue, ie. bubbles are at equilibrium.
+ − 1673 // GF = 100% when respiration == limit.
+ − 1674 temp_tissue = N2 + He;
+ − 1675 if( temp_tissue <= pres_respiration )
+ − 1676 gf = 0.0;
+ − 1677 else
+ − 1678 {
+ − 1679 overlay float limit = calc_lead_tissue_limit;
+ − 1680 // NOTE: in GF model, calc_lead_tissue_limit include already the
+ − 1681 // correction due to gradient factor. To compute the actual
+ − 1682 // current GF, we need to (re-)compute the raw ambiant-pressure
+ − 1683 // limit from the Bühlmann model.
+ − 1684 if( char_I_deco_model != 0 )
+ − 1685 {
+ − 1686 ci = char_O_gtissue_no;
+ − 1687 read_buhlmann_coefficients();
+ − 1688 var_N2_a = (var_N2_a * N2 + var_He_a * He) / temp_tissue;
+ − 1689 var_N2_b = (var_N2_b * N2 + var_He_b * He) / temp_tissue;
+ − 1690 limit = (temp_tissue - var_N2_a) * var_N2_b;
+ − 1691 }
+ − 1692
+ − 1693 gf = (temp_tissue - pres_respiration)
+ − 1694 / (temp_tissue - limit)
+ − 1695 * 100.0;
+ − 1696 if( gf > 254.5 ) gf = 255.0;
+ − 1697 if( gf < 0.0 ) gf = 0.0;
+ − 1698 }
+ − 1699 char_O_gradient_factor = (unsigned char)(gf+0.5f);
+ − 1700
+ − 1701 if( char_I_deco_model != 0 ) // calculate relative gradient factor
+ − 1702 {
+ − 1703 overlay float rgf;
+ − 1704
+ − 1705 if( low_depth < 3 )
+ − 1706 rgf = GF_high;
+ − 1707 else
+ − 1708 {
+ − 1709 overlay float temp1 = low_depth * METER_TO_BAR;
+ − 1710 overlay float temp2 = pres_respiration - pres_surface;
+ − 1711
+ − 1712 if (temp2 <= 0)
+ − 1713 rgf = GF_high;
+ − 1714 else if (temp2 >= temp1)
+ − 1715 rgf = GF_low;
+ − 1716 else
+ − 1717 rgf = GF_low + (temp1 - temp2)/temp1*GF_delta;
+ − 1718 }
+ − 1719
+ − 1720 rgf = gf / rgf; // gf is already in percent
+ − 1721 if( rgf < 0.0 ) rgf = 0.0;
+ − 1722 if( rgf > 254.5 ) rgf = 255.0;
+ − 1723 char_O_relative_gradient_GF = (unsigned char)(rgf+0.5f);
+ − 1724 }
+ − 1725 else
+ − 1726 char_O_relative_gradient_GF = char_O_gradient_factor;
+ − 1727 }
+ − 1728
+ − 1729 //////////////////////////////////////////////////////////////////////////////
+ − 1730 // deco_calc_desaturation_time
+ − 1731 //
+ − 1732 // FIXED N2_ratio
+ − 1733 // unchanged in v.101
+ − 1734 // Inputs: int_I_pres_surface, ppWater, char_I_desaturation_multiplier
+ − 1735 // Outputs: int_O_desaturation_time, char_O_tissue_saturation[0..31]
+ − 1736 //
+ − 1737 void deco_calc_desaturation_time(void)
+ − 1738 {
+ − 1739 RESET_C_STACK
+ − 1740
+ − 1741 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 );
+ − 1742 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 );
+ − 1743
+ − 1744 N2_ratio = 0.7902; // FIXED sum as stated in bühlmann
+ − 1745 pres_surface = int_I_pres_surface * 0.001;
+ − 1746 ppN2 = N2_ratio * (pres_surface - ppWater);
+ − 1747 int_O_desaturation_time = 0;
+ − 1748 float_desaturation_multiplier = char_I_desaturation_multiplier * (0.01 * SURFACE_DESAT_FACTOR);
+ − 1749
+ − 1750 for(ci=0; ci<NUM_COMP; ci++)
+ − 1751 {
+ − 1752 overlay unsigned short desat_time; // For a particular compartiment, in min.
+ − 1753 overlay float temp1;
+ − 1754 overlay float temp2;
+ − 1755 overlay float temp3;
+ − 1756 overlay float temp4;
+ − 1757
+ − 1758 read_buhlmann_ht();
+ − 1759
+ − 1760 // saturation_time (for flight) and N2_saturation in multiples of halftime
+ − 1761 // version v.100: 1.1 = 10 percent distance to totally clean (totally clean is not possible, would take infinite time )
+ − 1762 // new in version v.101: 1.07 = 7 percent distance to totally clean (totally clean is not possible, would take infinite time )
+ − 1763 // changes in v.101: 1.05 = 5 percent dist to totally clean is new desaturation point for display and NoFly calculations
+ − 1764 // N2
+ − 1765 temp1 = 1.05 * ppN2 - pres_tissue_N2[ci];
+ − 1766 temp2 = ppN2 - pres_tissue_N2[ci];
+ − 1767 if (temp2 >= 0.0)
+ − 1768 temp1 = 0.0;
+ − 1769 else
+ − 1770 temp1 = temp1 / temp2;
+ − 1771
+ − 1772 if( 0.0 < temp1 && temp1 < 1.0 )
+ − 1773 {
+ − 1774 // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested.
+ − 1775 // minus because log is negative.
+ − 1776 temp1 = log(1.0 - temp1) / -0.6931; // temp1 is the multiples of half times necessary.
+ − 1777 temp2 = var_N2_ht * temp1 / float_desaturation_multiplier; // time necessary (in minutes ) for complete desaturation (see comment about 5 percent)
+ − 1778 }
+ − 1779 else
+ − 1780 {
+ − 1781 temp1 = 0.0;
+ − 1782 temp2 = 0.0;
+ − 1783 }
+ − 1784
+ − 1785 // He
+ − 1786 temp3 = 0.1 - pres_tissue_He[ci];
+ − 1787 if (temp3 >= 0.0)
+ − 1788 temp3 = 0.0;
+ − 1789 else
+ − 1790 temp3 = - temp3 / pres_tissue_He[ci];
+ − 1791
+ − 1792 if( 0.0 < temp3 && temp3 < 1.0 )
+ − 1793 {
+ − 1794 temp3 = log(1.0 - temp3) / -0.6931; // temp1 is the multiples of half times necessary.
+ − 1795 // 0.6931 is ln(2), because the math function log() calculates with a base of e not 2 as requested.
+ − 1796 // minus because log is negative
+ − 1797 temp4 = var_He_ht * temp3 / float_desaturation_multiplier; // time necessary (in minutes ) for "complete" desaturation, new in v.101 float_desaturation_multiplier
+ − 1798 }
+ − 1799 else
+ − 1800 {
+ − 1801 temp3 = 0.0;
+ − 1802 temp4 = 0.0;
+ − 1803 }
+ − 1804
+ − 1805 // saturation_time (for flight)
+ − 1806 if (temp4 > temp2)
+ − 1807 desat_time = (unsigned short)temp4;
+ − 1808 else
+ − 1809 desat_time = (unsigned short)temp2;
+ − 1810
+ − 1811 if(desat_time > int_O_desaturation_time)
+ − 1812 int_O_desaturation_time = desat_time;
+ − 1813
+ − 1814 // N2 saturation in multiples of halftime for display purposes
+ − 1815 temp2 = temp1 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8
+ − 1816 temp2 = temp2 + 80.0; // set center
+ − 1817 if (temp2 < 0.0)
+ − 1818 temp2 = 0.0;
+ − 1819 if (temp2 > 255.0)
+ − 1820 temp2 = 255.0;
+ − 1821 char_O_tissue_N2_saturation[ci] = (char)temp2;
+ − 1822
+ − 1823 // He saturation in multiples of halftime for display purposes
+ − 1824 temp4 = temp3 * 20.0; // 0 = 1/8, 120 = 0, 249 = 8
+ − 1825 temp4 = temp4 + 80.0; // set center
+ − 1826 if (temp4 < 0.0)
+ − 1827 temp4 = 0.0;
+ − 1828 if (temp4 > 255.0)
+ − 1829 temp4 = 255.0;
+ − 1830 char_O_tissue_He_saturation[ci] = (char)temp4;
+ − 1831 } // for
+ − 1832 }
+ − 1833
+ − 1834 //////////////////////////////////////////////////////////////////////////////
+ − 1835 // calc_wo_deco_step_1_min
+ − 1836 //
+ − 1837 // FIXED N2 Ratio
+ − 1838 // optimized in v.101 (...saturation_multiplier)
+ − 1839 // desaturation slowed down to 70,42%
+ − 1840 //
+ − 1841 static void calc_wo_deco_step_1_min(void)
+ − 1842 {
+ − 1843 assert( 800 < int_I_pres_surface && int_I_pres_surface < 1100 );
+ − 1844 assert( 800 < int_I_pres_respiration && int_I_pres_respiration < 1100 );
+ − 1845 assert( 100 <= char_I_saturation_multiplier && char_I_saturation_multiplier < 200 );
+ − 1846 assert( 0 < char_I_desaturation_multiplier && char_I_desaturation_multiplier <= 100 );
+ − 1847
+ − 1848 N2_ratio = 0.7902; // FIXED, sum lt. buehlmann
+ − 1849 pres_respiration = pres_surface = int_I_pres_surface * 0.001;
+ − 1850 ppN2 = N2_ratio * (pres_respiration - ppWater);
+ − 1851 ppHe = 0.0;
+ − 1852 float_desaturation_multiplier = char_I_desaturation_multiplier * (0.01 * SURFACE_DESAT_FACTOR);
+ − 1853 float_saturation_multiplier = char_I_saturation_multiplier * 0.01;
+ − 1854
+ − 1855 calc_tissue(1); // update the pressure in the tissues N2/He in accordance with the new ambient pressure
+ − 1856
+ − 1857 clear_deco_table();
+ − 1858 char_O_deco_status = 3; // surface new in v.102 : stays in surface state.
+ − 1859 char_O_nullzeit = 0;
+ − 1860 int_O_ascenttime = 0;
+ − 1861 int_O_extra_ascenttime = 0;
+ − 1862 calc_gradient_factor();
+ − 1863 }
+ − 1864
+ − 1865 //////////////////////////////////////////////////////////////////////////////
+ − 1866 // calc_dive_interval
+ − 1867 //
+ − 1868 // Prepare tissue for delay before the next dive simulation.
+ − 1869 //
+ − 1870 // Inputs: char_I_dive_interval == delay before dive (in 10' steps).
+ − 1871 // Outputs: pres_tissue_N2/He[], CNS_fraction
+ − 1872 //
+ − 1873 // Should be protected by deco_push_tissues_to_vault(),
+ − 1874 // deco_pull_tissues_from_vault()
+ − 1875 //
+ − 1876 // desaturation slowed down to 70,42%.
+ − 1877 //
+ − 1878 static void calc_dive_interval(void)
+ − 1879 {
+ − 1880 overlay unsigned char t;
+ − 1881 overlay unsigned char backup_model;
+ − 1882
+ − 1883 //---- Initialize simulation parameters ----------------------------------
+ − 1884 N2_ratio = 0.7902; // FIXED, sum lt. buehlmann
+ − 1885 pres_respiration = pres_surface = int_I_pres_surface * 0.001;
+ − 1886 ppN2 = N2_ratio * (pres_respiration - ppWater);
+ − 1887 ppHe = 0.0;
+ − 1888 float_desaturation_multiplier = char_I_desaturation_multiplier * (0.01 * SURFACE_DESAT_FACTOR);
+ − 1889 float_saturation_multiplier = char_I_saturation_multiplier * 0.01;
+ − 1890
+ − 1891 // Make sure SURFACE_DESAT_FACTOR is applied:
+ − 1892 backup_model = char_I_deco_model;
+ − 1893 char_I_deco_model = 0;
+ − 1894
+ − 1895 //---- Perform simulation ------------------------------------------------
+ − 1896 for(t=0; t<char_I_dive_interval; ++t)
+ − 1897 {
+ − 1898 calc_tissue(2); // period = 10min.
+ − 1899 CNS_fraction = 0.92587471 * CNS_fraction; // Half-time = 90min: (1/2)^(1/9)
+ − 1900 }
+ − 1901 assert( 0.0 <= CNS_fraction && CNS_fraction <= 2.56 );
+ − 1902 int_O_CNS_fraction = (unsigned int)(CNS_fraction * 100.0 + 0.5);
+ − 1903
+ − 1904 //---- Restore model -----------------------------------------------------
+ − 1905 char_I_deco_model = backup_model;
+ − 1906 }
+ − 1907
+ − 1908 //////////////////////////////////////////////////////////////////////////////
+ − 1909 // deco_clear_CNS_fraction
+ − 1910 //
+ − 1911 // new in v.101
+ − 1912 //
+ − 1913 void deco_clear_CNS_fraction(void)
+ − 1914 {
+ − 1915 RESET_C_STACK
+ − 1916
+ − 1917 CNS_fraction = 0.0;
+ − 1918 int_O_CNS_fraction = 0;
+ − 1919 }
+ − 1920
+ − 1921 //////////////////////////////////////////////////////////////////////////////
+ − 1922 // deco_calc_CNS_fraction
+ − 1923 //
+ − 1924 // Input: char_I_actual_ppO2 : Current condition (in decibars).
+ − 1925 // char_I_step_is_1min : use 1min or 10min steps instead of 2sec.
+ − 1926 // CNS_fraction : velue before period.
+ − 1927 // Output: CNS_fraction, int_O_CNS_fraction
+ − 1928 //
+ − 1929 void deco_calc_CNS_fraction(void)
+ − 1930 {
+ − 1931 overlay float time_factor = 1.0f;
+ − 1932 RESET_C_STACK
+ − 1933
+ − 1934 assert( 0.0 <= CNS_fraction && CNS_fraction <= 2.56 );
+ − 1935 assert( char_I_actual_ppO2 > 15 );
+ − 1936
+ − 1937 if( char_I_step_is_1min == 1 )
+ − 1938 time_factor = 30.0f;
+ − 1939 else if( char_I_step_is_1min == 2 )
+ − 1940 time_factor = 300.0f;
33
+ − 1941 //------------------------------------------------------------------------
+ − 1942 // Don't increase CNS below 0.5 bar, but keep it steady.
0
+ − 1943 if (char_I_actual_ppO2 < 50)
+ − 1944 ; // no changes
33
+ − 1945 //------------------------------------------------------------------------
+ − 1946 // Below (and including) 1.60 bar
+ − 1947 else if (char_I_actual_ppO2 < 61)
+ − 1948 CNS_fraction += time_factor/(-533.07 * char_I_actual_ppO2 + 54000.0);
+ − 1949 else if (char_I_actual_ppO2 < 71)
+ − 1950 CNS_fraction += time_factor/(-444.22 * char_I_actual_ppO2 + 48600.0);
+ − 1951 else if (char_I_actual_ppO2 < 81)
+ − 1952 CNS_fraction += time_factor/(-355.38 * char_I_actual_ppO2 + 42300.0);
+ − 1953 else if (char_I_actual_ppO2 < 91)
+ − 1954 CNS_fraction += time_factor/(-266.53 * char_I_actual_ppO2 + 35100.0);
+ − 1955 else if (char_I_actual_ppO2 < 111)
+ − 1956 CNS_fraction += time_factor/(-177.69 * char_I_actual_ppO2 + 27000.0);
+ − 1957 else if (char_I_actual_ppO2 < 152)
+ − 1958 CNS_fraction += time_factor/( -88.84 * char_I_actual_ppO2 + 17100.0);
+ − 1959 else if (char_I_actual_ppO2 < 167)
+ − 1960 CNS_fraction += time_factor/(-222.11 * char_I_actual_ppO2 + 37350.0);
+ − 1961 //------------------------------------------------------------------------
+ − 1962 // Arieli et all.(2002): Modeling pulmonary and CNS O2 toxicity:
+ − 1963 // J Appl Physiol 92: 248–256, 2002, doi:10.1152/japplphysiol.00434.2001
+ − 1964 // Formula (A1) based on value for 1.55 and c=20
+ − 1965 // example calculation: Sqrt((1.7/1.55)^20)*0.000404
+ − 1966 else if (char_I_actual_ppO2 < 172)
+ − 1967 CNS_fraction += time_factor*0.00102;
+ − 1968 else if (char_I_actual_ppO2 < 177)
0
+ − 1969 CNS_fraction += time_factor*0.00136;
33
+ − 1970 else if (char_I_actual_ppO2 < 182)
0
+ − 1971 CNS_fraction += time_factor*0.00180;
33
+ − 1972 else if (char_I_actual_ppO2 < 187)
0
+ − 1973 CNS_fraction += time_factor*0.00237;
33
+ − 1974 else if (char_I_actual_ppO2 < 192)
0
+ − 1975 CNS_fraction += time_factor*0.00310;
33
+ − 1976 else if (char_I_actual_ppO2 < 198)
0
+ − 1977 CNS_fraction += time_factor*0.00401;
33
+ − 1978 else if (char_I_actual_ppO2 < 203)
0
+ − 1979 CNS_fraction += time_factor*0.00517;
33
+ − 1980 else if (char_I_actual_ppO2 < 233)
0
+ − 1981 CNS_fraction += time_factor*0.0209;
+ − 1982 else
+ − 1983 CNS_fraction += time_factor*0.0482; // value for 2.5
+ − 1984
+ − 1985 if( CNS_fraction > 9.99)
+ − 1986 CNS_fraction = 9.99;
+ − 1987 if( CNS_fraction < 0.0 )
+ − 1988 CNS_fraction = 0.0;
+ − 1989
+ − 1990 int_O_CNS_fraction = (unsigned int)(100.0 * CNS_fraction + 0.5);
+ − 1991 }
+ − 1992
+ − 1993 //////////////////////////////////////////////////////////////////////////////
+ − 1994 // deco_calc_CNS_planning
+ − 1995 //
+ − 1996 // Compute CNS during predicted ascent.
+ − 1997 //
+ − 1998 // Note: Needs a call to deco_push_tissues_to_vault(),
+ − 1999 // deco_pull_tissues_from_vault() to avoid trashing everything...
+ − 2000 //
+ − 2001 // Input: CNS_fraction, char_O_deco_time[], char_O_deco_depth[]
+ − 2002 // Output: CNS_fraction, int_O_CNS_fraction
+ − 2003 //
+ − 2004 void deco_calc_CNS_planning(void)
+ − 2005 {
+ − 2006 overlay unsigned char backup_gas_last_depth;
+ − 2007 overlay unsigned char backup_gas_last_used;
+ − 2008 overlay unsigned short backup_dive_mins;
+ − 2009 overlay unsigned char backup_actual_ppO2;
+ − 2010
+ − 2011 RESET_C_STACK
+ − 2012
+ − 2013 // Backup state machine
+ − 2014 backup_gas_last_depth = sim_gas_last_depth;
+ − 2015 backup_gas_last_used = sim_gas_last_used;
+ − 2016 backup_dive_mins = sim_dive_mins;
+ − 2017 backup_actual_ppO2 = char_I_actual_ppO2;
+ − 2018
+ − 2019 // Uses 1min CNS period:
+ − 2020 char_I_step_is_1min = 1;
+ − 2021
+ − 2022 //---- Retrieve bottom Gas used, and set variables.
+ − 2023 sim_gas_last_used = char_I_first_gas;
+ − 2024 sim_gas_last_depth = 0; // Surface gas marker.
+ − 2025 gas_switch_set(); // Sets initial calc_N2/He_ratio
+ − 2026
+ − 2027 //---- CCR mode : do the full TTS at once --------------------------------
+ − 2028 if( char_I_const_ppO2 != 0 )
+ − 2029 {
+ − 2030 overlay unsigned short t; // Needs 16bits here !
+ − 2031 char_I_actual_ppO2 = char_I_const_ppO2;
+ − 2032 for(t=0; t<int_O_ascenttime; ++t)
+ − 2033 deco_calc_CNS_fraction();
+ − 2034 }
+ − 2035 else //---- OC mode : have to follow all gas switches... -----------------
+ − 2036 {
+ − 2037 overlay unsigned char i = 0; // Decostop loop counter
+ − 2038 overlay float actual_ppO2;
+ − 2039 overlay unsigned char time, t;
+ − 2040
+ − 2041 //---- Ascent to surface delay
+ − 2042 // NOTE: count as if time is spent with bottom pressure,
+ − 2043 // AND the bottom gas
+ − 2044 actual_ppO2 = (pres_surface + char_I_bottom_depth * METER_TO_BAR)
+ − 2045 * (1.0 - calc_N2_ratio - calc_He_ratio);
+ − 2046 if( actual_ppO2 < 0.0 ) actual_ppO2 = 0.0;
+ − 2047 if( actual_ppO2 > 2.50 ) actual_ppO2 = 2.55;
+ − 2048 char_I_actual_ppO2 = (unsigned char)(100.0 * actual_ppO2 + 0.5);
+ − 2049
+ − 2050 // Ascent time (rounded up):
+ − 2051 time = (unsigned char)(0.1 * char_I_bottom_depth + 0.5);
+ − 2052
+ − 2053 for(t=0; t<time; ++t)
+ − 2054 {
+ − 2055 deco_calc_CNS_fraction();
+ − 2056 sim_dive_mins++;
+ − 2057 }
+ − 2058
+ − 2059 //---- Do all further stops ------------------------------------------
+ − 2060 for(i=0; i<NUM_STOPS; ++i)
+ − 2061 {
111
+ − 2062 overlay unsigned char stop_gas;
0
+ − 2063
+ − 2064 //---- Get next stop, possibly in reverse order ------------------
+ − 2065 {
+ − 2066 time = char_O_deco_time[(NUM_STOPS-1)-i];
+ − 2067 temp_depth_limit = char_O_deco_depth[(NUM_STOPS-1)-i];
111
+ − 2068 stop_gas = char_O_deco_gas[(NUM_STOPS-1)-i];
0
+ − 2069 }
+ − 2070 if( time == 0 ) continue;
+ − 2071
+ − 2072 //---- Gas Switch ? ----------------------------------------------
111
+ − 2073 if( stop_gas != sim_gas_last_used )
0
+ − 2074 {
111
+ − 2075 sim_gas_last_depth = deco_gas_change[stop_gas-1];
+ − 2076 sim_gas_last_used = stop_gas;
0
+ − 2077 gas_switch_set();
+ − 2078 }
+ − 2079
+ − 2080 //---- Convert Depth and N2_ratio to ppO2 ------------------------
+ − 2081 actual_ppO2 = (pres_surface + temp_depth_limit * METER_TO_BAR)
+ − 2082 * (1.0 - calc_N2_ratio - calc_He_ratio);
+ − 2083 if( actual_ppO2 < 0.0 ) actual_ppO2 = 0.0;
+ − 2084 if( actual_ppO2 > 2.50 ) actual_ppO2 = 2.55;
+ − 2085 char_I_actual_ppO2 = (unsigned char)(100.0 * actual_ppO2 + 0.5);
+ − 2086
+ − 2087 //---- Apply the stop
+ − 2088 for(t=0; t<time; ++t)
+ − 2089 {
+ − 2090 deco_calc_CNS_fraction();
+ − 2091 sim_dive_mins++;
+ − 2092 }
+ − 2093 }
+ − 2094 }
+ − 2095
+ − 2096 //---- Back to normal mode... --------------------------------------------
+ − 2097 char_I_step_is_1min = 0;
+ − 2098 sim_gas_last_depth = backup_gas_last_depth;
+ − 2099 sim_gas_last_used = backup_gas_last_used;
+ − 2100 sim_dive_mins = backup_dive_mins;
+ − 2101 char_I_actual_ppO2 = backup_actual_ppO2;
+ − 2102 }
+ − 2103
+ − 2104 //////////////////////////////////////////////////////////////////////////////
+ − 2105 // deco_calc_CNS_decrease_15min
+ − 2106 //
+ − 2107 // new in v.101
+ − 2108 //
+ − 2109 // calculates the half time of 90 minutes in 6 steps of 15 min
+ − 2110 // (Used in sleepmode, for low battery mode).
+ − 2111 //
+ − 2112 // Output: int_O_CNS_fraction
+ − 2113 // Uses and Updates: CNS_fraction
+ − 2114 //
+ − 2115 void deco_calc_CNS_decrease_15min(void)
+ − 2116 {
+ − 2117 RESET_C_STACK
+ − 2118 assert( 0.0 <= CNS_fraction && CNS_fraction <= 2.56 );
+ − 2119
+ − 2120 CNS_fraction = 0.890899 * CNS_fraction;
+ − 2121 int_O_CNS_fraction = (unsigned int)(CNS_fraction * 100.0 + 0.5);
+ − 2122 }
+ − 2123
+ − 2124 //////////////////////////////////////////////////////////////////////////////
+ − 2125 // deco_calc_percentage
+ − 2126 //
+ − 2127 // new in v.101
+ − 2128 //
+ − 2129 // calculates int_I_temp * char_I_temp / 100
+ − 2130 // output is int_I_temp
+ − 2131 //
+ − 2132 // Used to compute NoFly remaining time.
+ − 2133 //
+ − 2134 void deco_calc_percentage(void)
+ − 2135 {
+ − 2136 RESET_C_STACK
+ − 2137
+ − 2138 assert( 60 <= char_I_temp && char_I_temp <= 100 );
+ − 2139 assert( int_I_temp < 5760 ); // Less than 4 days = 96h...
+ − 2140
+ − 2141 int_I_temp = (unsigned short)(((float)int_I_temp * (float)char_I_temp) * 0.01 );
+ − 2142
+ − 2143 assert( int_I_temp < 5760 ); // Less than 96h too...
+ − 2144 }
+ − 2145
+ − 2146
+ − 2147 //////////////////////////////////////////////////////////////////////////////
+ − 2148 // deco_gas_volumes
+ − 2149 //
+ − 2150 // new in v.111
+ − 2151 //
+ − 2152 // calculates volumes for each gas.
+ − 2153 //
+ − 2154 // Input: char_I_bottom_depth, char_I_bottom_time for planned dive.
+ − 2155 // Gas list.
+ − 2156 // char_I_first_gas is the bottom gas.
+ − 2157 // decoplan (char_O_deco_depth, char_O_deco_time).
+ − 2158 // CF#54 == TRUE if shallowest stop first.
+ − 2159 // CF#56 == bottom liters/minutes (5 .. 50) or bar/min.
+ − 2160 // CF#57 == deco liters/minutes (5 .. 50) or bar/min.
+ − 2161 // Output: int_O_gas_volumes[0..4] in litters * 0.1
+ − 2162 //
135
+ − 2163
133
+ − 2164
0
+ − 2165 void deco_gas_volumes(void)
+ − 2166 {
+ − 2167 overlay float volumes[NUM_GAS];
+ − 2168 overlay float bottom_usage, deco_usage;
135
+ − 2169 overlay unsigned char i;
0
+ − 2170 overlay unsigned char gas, depth;
115
+ − 2171 overlay unsigned char lastGasStop = 255;
0
+ − 2172 RESET_C_STACK
+ − 2173
+ − 2174 //---- initialize with bottom consumption --------------------------------
+ − 2175 for(i=0; i<NUM_GAS; ++i) // Nothing yet...
+ − 2176 volumes[i] = 0.0;
+ − 2177
+ − 2178 assert(1 <= char_I_first_gas && char_I_first_gas <= NUM_GAS);
+ − 2179 gas = char_I_first_gas - 1;
+ − 2180
115
+ − 2181 bottom_usage = 20; // In liter/minutes.
0
+ − 2182 if( char_I_const_ppO2 == 0 && bottom_usage > 0.0 )
+ − 2183 volumes[gas]
+ − 2184 = (char_I_bottom_depth*0.1 + 1.0) // Use Psurface = 1.0 bar.
+ − 2185 * char_I_bottom_time // in minutes.
+ − 2186 * bottom_usage; // In liter/minutes.
+ − 2187
+ − 2188 //---- Ascent usage ------------------------------------------------------
115
+ − 2189 deco_usage = 20; // In liter/minutes.
0
+ − 2190
+ − 2191 depth = char_I_bottom_depth;
+ − 2192
+ − 2193 for(i=0; i<NUM_STOPS; ++i)
+ − 2194 {
+ − 2195 overlay unsigned char newDepth, time;
+ − 2196
135
+ − 2197 time = char_O_deco_time[31-i];
+ − 2198 if( time == 0 ) continue; // not yet: still search table.
+ − 2199 newDepth = char_O_deco_depth[31-i];
0
+ − 2200
115
+ − 2201 //---- Gas switch during or before this stop --------------------------
+ − 2202 for(;;)
0
+ − 2203 {
+ − 2204 overlay unsigned char newGas = 0;
+ − 2205 overlay unsigned char newStop = 0; // NO CHANGE yet
+ − 2206 overlay unsigned char j;
+ − 2207
+ − 2208 for(j=0; j<NUM_GAS; ++j)
+ − 2209 {
+ − 2210 // Skip gas without changing depth:
+ − 2211 if( ! char_I_deco_gas_change[j] )
+ − 2212 continue;
115
+ − 2213 // Select gas changed between [newDepth .. lastGasStop[
+ − 2214 // Note that <= means changing gas at BEGINNING of this stop.
+ − 2215 // Note that < means we cant use the same gas twice
0
+ − 2216 if( newDepth <= char_I_deco_gas_change[j]
115
+ − 2217 && char_I_deco_gas_change[j] < lastGasStop )
0
+ − 2218 {
+ − 2219 // Keep the DEEPEST gas in that range:
+ − 2220 if( char_I_deco_gas_change[j] >= newStop )
+ − 2221 {
+ − 2222 newGas = j;
+ − 2223 newStop = char_I_deco_gas_change[j];
+ − 2224 }
+ − 2225 }
+ − 2226 }
+ − 2227
115
+ − 2228 // Did we find something ?
+ − 2229 if( !newStop )
+ − 2230 break;
0
+ − 2231
115
+ − 2232 //---- usage BEFORE gas switch (if any), at 10m/min :
+ − 2233 if( deco_usage > 0.0 && depth > newStop )
+ − 2234 // Plus usage during ascent to the next stop, at 10m/min.
+ − 2235 volumes[gas] += ((depth+newStop)*0.05 + 1.0) // average depth --> bar.
+ − 2236 * (depth-newStop)*0.1 // metre --> min
+ − 2237 * deco_usage;
+ − 2238
+ − 2239 //---- Do gas switch:
+ − 2240 gas = newGas;
+ − 2241
+ − 2242 lastGasStop = newStop; // Mark last used gas
+ − 2243 if( newStop < depth ) // ascent to gas switch,
0
+ − 2244 depth = newStop;
+ − 2245 }
+ − 2246
115
+ − 2247 //---- usage AFTER gas switch (if any), at 10m/min :
0
+ − 2248 if( depth > newDepth )
+ − 2249 volumes[gas] += ((depth+newDepth)*0.05 + 1.0) // average depth --> bar.
+ − 2250 * (depth-newDepth)*0.1 // metre --> min
+ − 2251 * deco_usage;
+ − 2252
115
+ − 2253 //---- Do stop:
0
+ − 2254 depth = newDepth;
+ − 2255
+ − 2256 // Usage at stop:
+ − 2257 if( deco_usage > 0.0 )
+ − 2258 volumes[gas] += (depth*0.1 + 1.0) // depth --> bar.
+ − 2259 * time // in minutes.
+ − 2260 * deco_usage; // in xxx / min @ 1bar.
+ − 2261 else
+ − 2262 volumes[gas] = 65535.0;
+ − 2263 }
+ − 2264
+ − 2265 // From last stop to surface
+ − 2266 if( deco_usage > 0.0 )
+ − 2267 volumes[gas] += (depth*0.05 + 1.0) // avg depth --> bar.
+ − 2268 * depth * 0.1 // time to surface, in minutes.
+ − 2269 * deco_usage; // in xxx / min @ 1bar.
+ − 2270
+ − 2271 //---- convert results for the ASM interface -----------------------------
+ − 2272 for(i=0; i<NUM_GAS; ++i)
+ − 2273 if( volumes[i] > 65534.0 )
+ − 2274 int_O_gas_volumes[i] = 65535;
+ − 2275 else
+ − 2276 int_O_gas_volumes[i] = (unsigned short)(volumes[i] + 0.5);
+ − 2277 }
+ − 2278
+ − 2279 //////////////////////////////////////////////////////////////////////////////
+ − 2280
135
+ − 2281
133
+ − 2282
0
+ − 2283 void deco_push_tissues_to_vault(void)
+ − 2284 {
+ − 2285 overlay unsigned char x;
+ − 2286 RESET_C_STACK
+ − 2287
+ − 2288 cns_vault = CNS_fraction;
+ − 2289 low_depth_vault = low_depth;
+ − 2290
+ − 2291 for (x=0;x<NUM_COMP;x++)
+ − 2292 {
+ − 2293 pres_tissue_N2_vault[x] = pres_tissue_N2[x];
+ − 2294 pres_tissue_He_vault[x] = pres_tissue_He[x];
+ − 2295 }
+ − 2296 }
+ − 2297
+ − 2298 void deco_pull_tissues_from_vault(void)
+ − 2299 {
+ − 2300 overlay unsigned char x;
+ − 2301 RESET_C_STACK
+ − 2302
+ − 2303 for (x=0; x<NUM_COMP; x++)
+ − 2304 {
+ − 2305 pres_tissue_N2[x] = pres_tissue_N2_vault[x];
+ − 2306 pres_tissue_He[x] = pres_tissue_He_vault[x];
+ − 2307 }
+ − 2308
+ − 2309 // Restore both CNS variable, too.
+ − 2310 CNS_fraction = cns_vault;
+ − 2311 int_O_CNS_fraction = (unsigned int)(CNS_fraction * 100.0 + 0.5);
+ − 2312
+ − 2313 // GF history too:
+ − 2314 low_depth = low_depth_vault;
+ − 2315 locked_GF_step = GF_delta / low_depth;
+ − 2316 }
+ − 2317
+ − 2318 //////////////////////////////////////////////////////////////////////////////
+ − 2319 //
+ − 2320 #ifndef CROSS_COMPILE
+ − 2321 void main() {}
+ − 2322 #endif